Not to hijack, but I've been doing some research as well. It seems Microsquirt2 v3 (with some minor mods)can run with just the 24x GM wheel and no cam sensor. It is batch-fire fuel and waste-fire spark but several people are running 700hp+ boosted engines with it. Conveniently, when wiring for waste-fire spark the cylinder pairs are the same for an LS1 and small block mopar. It looks very simple to install and you can still use junkyard LS1 coils, throttle body, etc. I plan to install a 24x wheel like Quicksilver did and follow these directions:
http://www.yellowbullet.com/forum/showthread.php?t=543066

This seems like a simple option for those looking to tune their own car. Its about $350-400 for the microsquirt, so cost will probably end up about the same as using the GM computer and paying for the tune.