Frankenstein is giving me trouble...

As MO sez..... pull the heads and grind out the lower ends of the pushrod holes as needed. The pushrod angle is steeper due to the taller roller lifters. It won't hurt anything to grind the holes more even if they break out on the inside.... MO has shown you that in his pix in post #5.

As for the contact patch, moving most of the way across the valve inside to outside is normal for stamped rockers. Their contact is designed to walk across the valve tip as the valve lift increases. If they rock so far as to go over the outside edge, then maybe be concerned. If not much, try it. It may wear a little crescent in the outer edge of the rocker contact if it gets too far over.

As for the left-to-right contact patch, it is never going to be perfect for the stamped rockers. But a problem here is that you have the hold-downs wrong in pix #11. They should go small-large-small-large-small from one end to the other.