On my 61 Ventura the insulation has a sight "in service" depression from the air cleaner. I use the large big car air cleaner so it gets kind of close to the hood. My PO replaced the hood insulation but he used the small air cleaners. Fortunately I never had the big air cleaner when the car had the taller 64 manifold. I had gone to a date correct 61 manifold before I scored the big air cleaner.
But there is a problem with the generator if you have AC in some of the big cars. It requires a small cut out of the insulation or the generator fan will shred the insulation.
But you have an A body. Parts book lists 9775371 for T/6 and T/8 in 64. 9780586 for T/6 and T/8 in 65 and 66. That's as far as the 66 parts book goes but one would think that 67 is the same as 66. No mention of exceptions for 3x2.
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