My exp with my stk parts SD455,35 yrs ago. Car weighs approx 3740. Heads were done by AHines Racing out of Lawrence burg Ind. He was doing engines for different Pontiac guys. Anyways I had some input from John Herslow.John said to run 4.56 gears. I tried them with basic slapper bars. Car was spinning,i tried adjusting shocks ex.just couldnt get good consistent times. So I put 4.10s in got car to 12teens at 110. Still not good. He had gone 11.70s. So we talked. He gave me a cam that he said went the fastest with,however he said car was popping through carb. I have cam but was afraid to use it. My point being you need all the dyno time, testing in car to find what works.Another you could estimate hp, work backwards car weight,mph get ball park figure for required hp. I do think heads are modified with acid to get the flow for the hp. I'm satisfied at my age if I was younger I would test different ideas. Automatic trans are in the $5k range I've been told,gulp! for me. Testing ,more testing.i will tell you for my SD that the qjet 2nd metering rods are very very thin,I picked up when I did that the engine wants fuel.
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