The 64-7 GTO factory headers tuck in a little tighter to the block.
The frame on the earlier A-body cars is narrower around the engine, so the headers fit a little closer to the block.
One thing that would do is put the heat radiating off them a little closer to your starter motor.
Everyone says they will also fit the later models, but we've never actually tried that.
Having three-bolt flanges on both sides is a plus.
Good luck!
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