Blown 68
I have a set of NOS Mickey Thompson std. forged 421 pistons, flat top, press fit with pins. These were the ones used in SD cars back then. You would only have to bore the 389 block .030 over. Enginecraft in Michigan can supply a 4 inch stroke crank that drops in the 389 block for around $350. I'll let the pistons go for $325 and I'll pay for shipping.
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