Better grab a 360 intake gasket and slap it on the D64 to see if it’s feasible. I grabbed an Offy DQ for the 340 I'm building, and no way in hell I would trust the gasket to stay put lol.
Porting the D64 to a 340/360 port window, I don’t think it’ll work. In my video above your post, that’s the D64, stock ports on top of Edelbrock heads working just fine.