Thanks Gary, you answered my first and biggest question right off the bat (ie. what is this thing?). Based on that hopefully I can find some service manuals. I know it's highly modified (running a Stinger EMS and with the single Turbonetics Turbo) but that should still help. It's currently running great, I just want to be able to keep it that way.
Up until now I've been running Volkswagen powered buggies (and rebuilt a couple engines from the bottom up) and based on that I can't conceive how exhaust and intake valves can collide. Going to have to find some engine diagrams.
ETA: OK, found a diagram and see what you're talking about. I'll be sure to keep a nice solid belt on it at all times!