1965 273 Intake Manifold question

dragnknights said
Ok, so I'll need to get an original intake manifold or possibly modify the bolt holes on the one I have?

Are your bolts 5/16 which is 64 and 65 or 3/8 whiuch is 66 and newer? The 5/16 is usually a 1/2 head and the 3/8 is a 9/16 head. That will tell you what heads are on it.