I would focus on the headgasket first. My supra only had 60K when it blew it's head gasket. Get ARP bolts and a stock toy head gasket and you should be cool, unless you want to run massive boost then I'd get the HKS metal HG. It's a pretty common deal with the supra's, the headbolts were only torqued at 58 lbs. ft. when they should have been 75 lbs. from the factory. They tend to loosen up over time and the gasket wears out, normally in the #6 cylinder. Toyota should have issued a recall on it like they did with the v6 pickups.
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