Wow, that's not good news at all, especially after you got it looking so good & installed.
Just for your comparison, I bought everything from Egge to rebuild my F-head including valves, springs, guides & extra gaskets for the "post break in" re-torque & adjustments...... but not the phenolic timing gear, cam, lifters, push rods & crank....... $1477 delivered.
Machinist & I had to literally drive the pistons (stuck rings) out of the block with an 8lb sledge hammer even after soaking a couple months with Kroil. Machinist still only went .030 over to get the bores clean & round. I think Egge has pistons up to .060 over, your block would have to be gouged pretty bad to go that far.