I've installed 4 bolt factory caps on 2 bolt(4 bolt location) and only line honed.
The Pontiac block is better located then "MOST" factory block produced.
So I don't think the Pontiac block is like finger prints. They are just better machined from the factory. that's all.
Build it fast, build it right, build a Pontiac.
http://PontiacDude.cc