I just skimmed through this thread, but OP, seems like you got beat! aka sold a lemon! Fact, Florida is not the hottest place in the united states. The next few days temps in Arizona will be hotter than Florida for instance.
Being that we/I know were the seller stands on the performance of a stock engine, I think that he actually believes what he is telling you, when he said
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Redtops aren't made to go past 65mph and to be able to do that I'd have to get a bigger turbo and a 6 speed trans.
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wow. this is my car. Everything is OEM and its perfect. His problem is that redtops are not designed to be at 3600RPM on the highway in Florida weather; thats it. the turbine is too small and the gearing is too short for it. If you disconnect the turbine it will no longer overheat because thats where all the heat is coming from. otherwise, I told him to just drive 65MPH @ 3000rpm because thats where engine vacuum is 10" about as low as you want to go for steady highway speeds.
At 80MPH and 3600RPM the vacuum is around 3"-5" the engine is damn near in boost and it gets hot after 50 miles on that T-25, yeah. I suggested the 6-speed because then you can run the 3.4x gearing and drop the cruise RPM. Likewise he can upgrade the turbo to something with a larger turbine and that will also remove the heat from the engine.
A; upgrade turbine
B; better gearing
C; drive slower (3000RPM and 10" vacuum)
D; disconnect turbine (free) highly recommended for highway drives if you are going to beat on the engine with outlandish RPM
E; cooling system upgrade (but I prefer OEM radiator)
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I really don't think you should take on this project, there's definitely issues somewhere, be it a blown, warped or just a shitty build. Maybe you could get a refund or have the seller fix the obvious issue of overheating.