Rusty, I posted the valve seat and valve head dimensions for you in the other thread in which you asked about them and in which I had given some other specs for you.
It is 2.025-2.015-inch on the intake valves; 1.640-1.630 on the exhaust valves.

In response to fordman428's question about the Y-Blocks and their distributor location, no, sir, not ALL Y-Blocks had them at the back. They did put them in the front on some of the later engines.