Map sensors are two different connectors. Likely he kept his L67 sensors.
I'm running a Gen V off an L67 tune. It's not that far off in actuallity because both blowers displace 90 cubic inches of air per revolution. Hence the M90 designationGen V handing off a cooler charge.
Injectors..he's likely running his stockers. Since he can't swap the L32 rail on. but if not..great idea.
I'm thinking lean/vacuum based on the fact that it idles nice and light acceleration works well. Anything beyond that and as long as you aren't in boost.. ...hmmm now to rethink this. Do me a favor..triple check your plug wires. Make sure you have them right. Because it's possible to cross a couple and have it run nice and then go to hell at load etc. I know usually it idles like crap..but there are a couple cylinders you can do and have it be off. Trust me. lol