O-ringed the deck and use a copper head gasket along with good fasteners. The rest you've been already told. A spot on tune will definitely be needed.
My mostly stock 318 went from 160hp on the Dyno to 536hp on back to back pulls. Stock 2bbl and exhaust to GT45 turbo and a 800 cfm Thermoquads using C 12. The only failure was the head gasket. I O-ringed the deck and installed copper head gaskets it has held up to 26lbs. of boost at the intake.
If it See's detonation at those power levels bring a shovel and a bag. Dave
Re-reading this thread again for tidbits and just noticed you said THERMOQUAD.
Do you mind expounding on the mods that were required to run boost?
I have one in the big bore version on the shelf.
