Thanks for all the info and pics! Not sure why he changed the pistons, supercharger, valves, etc... You are right these engines go forever. He told me his mechanic told him since they had to replace the intake gasket they might as well upgrade those parts. He also said he had the heads and supercharger "flowed". The previous owner is a "speed freak" he had alot of other go fast goodies in his garage.
I owned one of these cars in 04 for 2 1/2 years and put 100k on it. I remember it was fairly quick, If I remember right I would say mid to low 14's stock? This one is quicker according to the butt dyno, so he did do something to it. He is having all the paperwork sent to me. A freind of his family who works at SLP apparently did the work for him so he didn't have the paperwork handy.
I will check the SC tonight when I get home and try the carb cleaner on the vac lines. I had a 90 Turbo GP that had the same problem, took me forever to find the damn leak...
