I am trying to determine if my application requires a group 24 or Group 27 battery. The battery tray was long ago replaced so I am not sure if that would have been any indicator. In review of the AMA specs for my application it appears my January 72, Dearborn build, 351 2V Mach 1 with heated back glass and no AC was equipped with a 61 Amp alternator and the group 27 battery. I am not sure though. The Build Sheet for 72 indicates codes "AB" under battery and "61" under Alternator Code. Marti Report does not indicate an optional upcharge for a group 27, but it may have been part of the $42 heated backlight option.
Advice on proper battery and alternator application would be appreciated.