Ok i have a 93 T-bird LX with the 3.8 and i wont to turbo charge it. Now i know that they have major problems with the head gaskets and i was planing on using O-ring seals to fix that. I wonted to know how much boost a stock 3.8 can take before the internals start to brake.

Not much. If you want it you're better off rebuilding the engine with parts that handle it.