Yep, nope, and definitely no. The heads can be ported more than any other l a production head , pushrod relocation and solid lifter rocker arm assembly. As far as six pack you cannot buy the manifold new anymore, though aftermarket carburetors are available new from Holly. But the thicker block webbing that was designed for to accommodate a four bolt main cap increases the strength of the block, put that together with overall rarity and you basically have the cream of the crop of production la small blocks, designed from a racing pedigree no doubt!!
