The Stage 3 Livernois heads flow very good, but it sucks that the stock 5.0 heads flow better than the Stage 3 Livernois heads. It also infuriates me that the 5.0 is so hard to fit into a street driven car without a lot of changes. Then another part of me is thinking along the lines of the 6.2 even with the standard 2V heads it has may indeed be the ticket for N/A due to its displacement without figuring out how to run the 5.0 4V heads.
Then we get to playing with longer valves, taller springs, and reduced base circle cams. 