Gator McClusky car

[Kern Dog]

There was another flick they did White Lightning (after that in 1973 IIRC)
Gator McClusky (spell) character

 

[BeatersRus]

Google AI says this;
"429 cubic inch police interceptor Cobra jet big block V8 engine with dual four-barrel carburetors, a close-ratio Hurst four-speed manual transmission, and reinforced suspension"

Also that the two movie cars were destroyed, one totalled on the barge scene, the other scrapped after filming was over.

thats Google Ai,not hal needhams memory.
none of those cars were 4 speeds,or dual carbs,and they were Deffo reinforced suspension.
you can literally See the column shifter handle in the clip provided by 64abel.
then they Switch to a mustang interior and him shifting the 4 speed.