Quote: (as said) what converter/cranking compression. HP or lowpo ex manifolds? total vehicle weight? I'd want 3.55's or 3.91's. how tall are those tires? non restrictive air cleaner?. with 20" of vac you do have a healthy long block. You might bring the curve in faster (lighter springs) & bottom line-no pinging allowed.
HP exhaust manifolds 255/630/15 Diamondback Redlines Stock dual snorkel air cleaner with paper filter 1967 COronet RT Convertible
ex manifolds? total vehicle weight? I'd want 3.55's or 3.91's. how tall are those tires? non restrictive air cleaner?. with 20" of vac you do have a healthy long block. You might bring the curve in faster (lighter springs) & bottom line-no pinging allowed. 
