I am running high 11s low 12s with stock small valve J heads.I would try some gear,slicks and tuning before spending big money on the heads.
Heres what I have.
360 9.7 to 1 comp.,MP508/292,single plane int.750DP Holley,10 inch 3500 conv.3.91 gears.weight is 3350.
You are going to need at...