ah, the one year cast iron 4v, that's very rare.
you're aware that there was also a 300 / 4v in 1964? it's just that that intake is aluminum ( 64 heads are also alum for the 300 ) and has narrower runners than will properly match up with the cast iron heads.
this is not a huge deal as the narrower passage is upstream, thus no reversion step. the narrower passage in the alum will choke flow relative to what you could get from the larger passage cast iron intake however.
parts can be adapted or used directly from the Rover v8 ( 1966-2004 ) and Buick 90* v6.
if trying to adapt a Rover intake you'd have to fab up shim plates as the Buick 300 has a taller deck than the Rover engines.
if you've got your heart set on a Buick cast iron intake, keep an eye out on the AACA forums.
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