Let me suggest another approach to your fuel pump problem. Plug the bolt holes in the block with short pieces of cut-off bolts or all thread, and reposition the holes to center the pump lever on the camshaft lobe. It might be necessary to drill and tap the existing holes for a bigger plug so you don't get overlapping threaded holes. Anchor the plugs with red Loctite or even braze them into place before you start drilling and tapping for new pump mounting bolt holes. Trying to make the pump fit an offset mounting point is going to end up with two modified pieces instead of just one.
Jerry
Another option would be to tap them for pipe threads and use pipe plugs ground off flush. Then redrill and tap for the correct location. It probably wouldn't matter if you overlapped the threads then as they'd be TIGHT. Your original size bolts may be a pretty sloppy fit, although loctite stud locker will fill the clearance as suggested. Just about any straight tapped hole would have the same issue. They make locking pins for fixing block cracks that have interference fit, but that system is kind of expensive.
