Ok, don't know alot about engine work...was more into making the car look good, but now I'm rebuilding the engine and needed some. I've got a GS, 420A in it and the suggestion was to bore engine 20 over with JE pistons w/compression no higher than 11.5:1...seems too high but wanted to get as much out of engine without turbo or nos. Other mods include TB bore along w/ intake manifold, headers, gears, pulleys, and exhaust...any suggestions would be very helpful.