I won't get into the later model mustang stuff, but I will talk about the 302. Is you car a V8 car or a 6cyl? I put an ATK 302 roller cam 302 into my car and just transferred all of the 289 accessories over to it. If you go with ATK, like no1hedberg said, you want the front sump model. it is the
ATK 300HP 302ci HP79
I used a
Weiand Stealth 8020 intake, Hedman longtube headers, and a
Holley 4160 1850 600CFM carb in the car. I just basically dropped the engine right in, however, I mentioned before than my car was originally a 289-4V car.
Here is the engine after it was painted "old Ford Blue"
Here is another shot of it in the car....