The OP mentioned straightening the lifter bores... Assuming he means bushing them along with blueprinting their locations, I understand the oil control benefits. But is there a measurable performance improvement?"

EDIT: This is of interest to me because my current block has had the lifter bores corrected bushed, but it's "tired" and the cylinders couldn't take anything more than a re-hone during the last rebuild. I've got a freshly machined block to replace it, but the one job the shop that did the work wasn't equipped to do was the lifter bores. Not sure if I should plan to haul it somewhere else to get that done, or build it as is.