Help spec'ing out a new small block

Newbomb Turk said
Any head I know of with larger than a 2.100 valve (and a 1.6 exhaust) requires moving the valve centers to get the valves to fit.

I just used the W7 as an example but that the rule.

I get what you're saying. I wish Edelbrock would just come out and say what is required to run these heads on a stock block with 4" bore.