F.A.S.T. drags has opened the rules up over the years, and is allow “approved” aftermarket blocks and heads, running a Pontiac they can likely be running a big bore aftermarket AI2 or MR1. The top bbc and hemi’s are running aftermarket heads and blocks with modified stock intakes and carbs for the model of engine.. The carb throttle plates have to be stock diameter and same type carb as stock.
The quickest cars are making over 700HP too the wheels, thru exhuast manifolds and a 2.5” exhaust.
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