Here’s some Marti Report information...
I’ve got copies of 13 Marti Reports for cars with the Heavy Duty Battery option.
They break-down as follows:
Dearborn
1967 390-4V Mustang GT Fastback – With A/C, build date = 3/15/1967
1967 390-4V Mustang GT Convertible – No A/C, build date = 4/17/1967
1967 289-2V Mustang GTA Fastback – No A/C, build date = 7/12/1967
1967 289-4V Mustang GTA Convertible – No A/C, build date = 8/2/1967
San Jose
1967 289-4V Shelby GT350 Fastback – No A/C, build date = 3/22/1967
1967 428-4V Shelby GT500 Fastback – No A/C, build date = 4/13/1967
1967 289-4V Shelby GT350 Fastback – No A/C, build date = 5/4/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 5/8/1967
1967 289-4V Shelby GT350 Fastback – No A/C, build date = 6/7/1967
Metuchen
1967 390-4V Mustang GT Fastback – No A/C, build date = 1/5/1967
1967 289-2V Mustang (T5) GT Hardtop – No A/C, build date = 2/22/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 3/9/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 5/26/1967
FYI – The Marti Reports do not include Alternator information. Other than these cars all being GT/GTA/Shelbys, there doesn’t seem to be a correlation to any other options.
That being said, I have copies of Marti Reports for another 42 GT/GTA cars, and they do not have the Heavy Duty Battery option.
(Of them, 14 also had Air Conditioning)
Dearborn
1967 390-4V Mustang GTA Fastback – With A/C, build date = 12/15/1966
1967 390-4V Mustang GT Fastback – No A/C, build date = 12/28/1966
1967 390-4V Mustang GTA Fastback – With A/C, build date = 1/24/1967
1967 390-4V Mustang GT Fastback – With A/C, build date = 2/21/1967
1967 390-4V Mustang GTA Hardtop – No A/C, build date = 2/25/1967
San Jose
1967 390-4V Mustang GTA Fastback – With A/C, build date = 8/22/1966
1967 390-4V Mustang GTA Convertible – No A/C, build date = 9/22/1966
1967 390-4V Mustang GT Fastback – No A/C, build date = 9/28/1966
1967 390-4V Mustang GTA Fastback – No A/C, build date = 10/3/1966
1967 390-4V Mustang GT Hardtop – No A/C, build date = 10/27/1966
1967 390-4V Mustang GTA Convertible – No A/C, build date = 11/10/1966
1967 390-4V Mustang GTA Fastback – With A/C, build date = 11/12/1966
1967 390-4V Mustang GT Convertible – No A/C, build date = 11/15/1966
1967 390-4V Mustang GT Hardtop – No A/C, build date = 11/30/1966
1967 390-4V Mustang GTA Fastback – No A/C, build date = 12/13/1966
1967 390-4V Mustang GT Fastback – No A/C, build date = 12/20/1966
1967 390-4V Mustang GTA Fastback – With A/C, build date = 12/21/1966
1967 390-4V Mustang GT Fastback – No A/C, build date = 12/29/1966
1967 390-4V Mustang GTA Hardtop – With A/C, build date = 1/9/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 1/11/1967
1967 390-4V Mustang GTA Convertible – With A/C, build date = 1/31/1967
1967 298-4V Mustang GT Fastback – No A/C, build date = 4/20/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 4/20/1967
1967 289-4V Mustang GTA Fastback – With A/C, build date = 5/2/1967
1967 298-2V Mustang GTA Hardtop – No A/C, build date = 5/9/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 5/17/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 8/2/1967
1967 390-4V Mustang GTA Hardtop – No A/C, build date = 8/3/1967
Metuchen
1967 390-4V Mustang GT Hardtop – No A/C, build date = 9/19/1966
1967 390-4V Mustang GTA Fastback – With A/C, build date = 9/29/1966
1967 289-4V Mustang GT Convertible – No A/C, build date = 11/28/1966
1967 390-4V Mustang GTA Hardtop – With A/C, build date = 12/3/1966
1967 390-4V Mustang GT Fastback – No A/C, build date = 1/24/1967
1967 390-4V Mustang GTA Fastback – No A/C, build date = 1/26/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 4/2/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 4/5/1967
1967 390-4V Mustang GT Fastback – With A/C, build date = 4/20/1967
1967 390-4V Mustang GTA Fastback – With A/C, build date = 5/2/1967
1967 390-4V Mustang GTA Convertible – No A/C, build date = 5/9/1967
1967 390-4V Mustang GT Convertible – No A/C, build date = 5/15/1967
1967 390-4V Mustang GT Fastback – No A/C, build date = 7/18/1967
1967 390-4V Mustang GT Convertible – With A/C, build date = 7/28/1967
Hope this information helps!
Kevin