273 engine questions

Yep. The #315 heads are 64-65 numbers and the intake is a 66-67 non CAP intake. 99% sure it was redrilled.[/QUOTE
The#330 block is a 64-66 casting number.

I put that in the original post. But how do I tell if it was a commando engine and the actual year. I was guessing since the heads were 64-65 it must be a block used in 64-65 and not in 66.