I can get the valves enlarged at the shop I take everything to, I was thinking of it, but wanted to look at the combustion chambers to see if and how much it would be advantageous to go out, a friend of my dad's put larger valves in one of his heads and actually dropped his flow on the bench because the valve was too close to the side of the chamber. He had to grind away a bowl next to it until it had enough clearance to flow well and try to match the shape on the rest of the chambers.

The cam I was planning on buying is the 300 degree cam, I think that is seat to seat rather than 050, but I'm not sure.

Any thoughts on which block to use? 70 or 73... I'd rather keep my 70 block as a spare in case I throw a rod I don't ruin my numbers matching block.

I'll polish the exhaust, and port the intake, do you know about how much material is safe? I have access to a flow bench to check my progress, but I don't want to risk punching a hole through the runner.