My only experience was with an older cousins '65 GTO. He had the progressive rod rigged so when he street raced, he could lock it and the end carbs opened immediately. 4 speed with 4.11 gears and cheater slicks. Car was danged fast for the day.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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