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Sorry, but I think you're on a long painful nickel/dime road to discover the obvious.
It's not the heat exchanger - it's top end related - cracked head, D-chunk or gasket.
Forget the 3.2 swap. You need the DME, Wiring Harness, Accelerator assembly, fuel system (tank, return lines, etc.). These bits will total more than the car is worth.
Essentially what you have is a non-ticking timebomb with a chocolate milkshake in the sump.
You have a relatively high mileage 2.5 car which has, or is soon to have, issues with the top (rear window, motor cables, etc.), motor mounts, CV boots, not to mention interior, electrical, or bodywork issues.
Assuming you do sort it out, at the end, you're gonna pour more into it than it's worth and still end up with a car no one will want.
Sell it now to a prospective spec racer for whatever you can get and apply that to a car better sorted.
I don't want to be Mr. Negative...I'd like to paint a rosier picture, but based on your reports, I just can't.
Cheers!
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