Got the heads back on and torques down to 100 ft lbs - pretty good workout after going through 3 steps on each of 20 bolts
I did the feeler gauge test with a carpenters square and it appeared to be flat - couldn't get a .008 feeler gauge under it, which was the smallest gauge I had. The "book" said .003 was the tolerance so got my fingers crossed on that.
I'm opting out of the rockwell test and valve seals - the things have just been rebuilt 250 miles ago by Keith Craft and it wasn't exposed for that long to the heat. So, I'm going to roll the dice and take my chances.
Now off to wrestle the intake and intake gasket! and then on to figuring out the pulley alignment.
Thanks!