If I had that 428 I'd keep the 670 heads and run a 4.25" stroker kit to complement the 4-bolt mains and then sell the 4" stroke crank for a high premium to one of those guys that believe there's something magical about it. I'd run big dish forged pistons with enough volume to drop the compression ratio down to no more than 9.3:1.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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