I doubt even a genius tech inspector will know what to look for on that head--other than the obvious, like too much porting, etc.

Face it, these cars--while neat as hell--are ancient orphans. Unlike a Honda, you simply are not going to find many around--let alone on a race track--and most technical knowledge is in the hands of the owner-driver (and there are not likely to be many competitors driving the same car).

Use what you can to keep the car in competition.