When I was actively looking for one before I bought my 240, supraforums.com had a decent MKIII community.
Definately has head gasket issues, paper head gasket and head bolts that only get torqued to like 58 ft/lbs from the factory is a bad combination. Heavy, heavy car. Personally, I think they look fantastic but they are starting to get dated.
I think if your planning to build a dedicated track car, there are better options depending on what kind of racing your going to do.
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Andy - Reinstated
Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
'98 Civic EX - CTR headlights and grill, Kosei K1's, for sale
'90 240SX - SR20DET that will never get installed, project car.