65 273 Intake manifold

But, it's a moot point if it's a '65, since the manifold won't fit. Start looking either for some '66 and later 273/318 heads, or a Commando/Charger or old Eddy D4B 4bbl. manifold to fit your '65 heads.

To be clear, are you saying a Performer intake won't fit heads with the early bolt angle?