John, my bad.
As Chris showed, 545467 is the RH, serviced as an assembly with the HRV. It was the log manifold for the big Pontiac and A body in '64. I think it was also used for both in '63 but you should recheck to be sure.
I think I got the big Pontiac LH casting p/n 545470 correct but you should recheck that one also.
It was the '64 LH 9773442 that was unique to the '64 A body.
My only excuse is that I am working without a net these days. Since a recent move, all of my reference material is in storage.
I should have gone out to my car and confirmed the p/ns that way. I got lazy and relied on my memory.
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