I tried calling Edelbrock and they are closed until after New Years. I wanted to ask them directly. Looks like I will be returning the heads and getting the 60779 heads. I guess they have a 63 vs a 65 chamber and the say they are cnc matched intake and exhaust and have some hand bowl work done to them. So am I assuming these are the same as what I ordered only with additional machine work to help them flow better?