Topic: Correct carburetor info needed

[2stangs]

So, in efforts to move towards perfection...

My car Tag: 1969 Mach I, 4 Spd manual trans,  S code 390 4V, built April 1969 in San Jose, Calif.
Current carb on car:  stamped  D2AF AA. Which I believe is a Ford F4-4300.
Some research tells me that the originally installed carb would have been an Autolite 4300 C9ZF-E

So my questions:
What kind of point deductions would happen if the F4-4300 D2AF_AA were left on the car?
Concours perfection aside, which carb would perform better/make the car run best?

[Bob Gaines]

So, in efforts to move towards perfection...

My car Tag: 1969 Mach I, T5 trans,  S code 390 4V, built April 1969 in San Jose, Calif.
Current carb on car:  stamped  D2AF AA. Which I believe is a Ford F4-4300.
Some research tells me that the originally installed carb would have been an Autolite 4300 C9ZF-E

So my questions:
What kind of point deductions would happen if the F4-4300 D2AF_AA were left on the car?
Concours perfection aside, which carb would perform better/make the car run best?

MCA thoroughbred class is the only class that part numbers are expected to identify all parts. No reproduction or aftermarket parts of any kind are allowed in that class without deduction. In the concours driven and trailered concours as long as the D2 4300 looks the same externally in all aspects as the C9 carb then there should not be a deduction . At the most there might be a mention in the notes. There are differences between a D2 carb and the C9 carb by virtue of the different engineering number. Some differences may be internal and some may external . The 4300 carbs typically look basically the same with minor differences . I haven't studied the 4300 carb extensively so I can not say specifically what the differences between the two are. If any external differences are noticed expect some kind of deduction.   You should also know that in those class's the T5 will be a deduction along with shifter assembly,crossmember and any attaching hardware etc. Not condemning your mods but letting you know what to expect if entering in a MCA concours venue.   

[J_Speegle]

First welcome to the site. Hope you find the support and information your looking for related to your Concours focused projects.

As for your questions. Deductions would depend on the class and the organization the car was being judged at. In many places they will not be removing or having you remove the air cleaner for a closer look. If its not then if the judge can see a detail that is different (castings, attachments to and other details) then expect a deduction. If they don't catch one then your ok until the next show and set of judges.

As far as performance I suggest you post a question on one of the other forums where that sort of thing is their focus  - I doubt that any one here has likely had those two specific carbs on a car to have an experience the differences. Give this was the early emission years so a lot of changes could and did take place in a short period - not all of the successfully and they were not focused on performance improvements in general

As for original car it would have been C9ZF-E for 4 speed equipped -   C9ZF-F for automatic equipped

Again welcome to the site

BTW got to ask. Your description you included shows transmission T5. Is that how your door tag is stamped or do you have a T5 aftermarket transmission. If its the door tag the T5 is likely (given the other information you provided) is the exterior paint code - T being the color Candy Apple red and the 5 for the hood black out as part of the Mach I package. Just asking 

[2stangs]

Oh man, I think my brain had a spasm...I must have been thinking about the T5 trany in my '88 Foxbody.  Sorry. You both are right about T5 being the color code for this car! This '69 has a 4 speed manual trans.