64 Blocks use the older 12 bolt manifold and it's different that the (65-79) manifolds? (61-64 )That said if you want to run newer open chamber heads or new Aluminum, heads you really need to do a piston change for the valve angles. I know some guys run the new heads on the older blocks without the piston change but I wouldn't. Push rods are different and all valve geometry will be off. In my book its a No No.
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