Another update:
After measuring the head bolt hole positions on the block I find that the holes in the head posted previously have up to about .020” variation in relation to the tapped holes in the block so for absolute precision I have more work to do. I will accurately plot all positions on the deck surface this weekend and fire off a CAD drawing to Scott including the lifter bore positions. A couple years ago I measured the position of the pushrod cover holes in order to make myself one and the plate bolted on perfectly to both a 235 and 261 which gives me a great deal of faith in the position of the tapped holes in the block. Back to work I go.
