Probably not the fan clutch. That problem shows up worse at low speeds/stuck in traffic. My vote is for a clogged radiator, internally or externally.
Could also be exhaust restriction. The stock mufflers soot up. I removed my resonator and replaced it with pipe. Then I replaced the stock muffler with a straight-through (cherry bomb) muffler. It sounds OK and the boost pressure rises quicker (a lot) when I floor it.
These things use a lot of special hoses in the cooling system. I've replace a lot of the special ones with copper pipe fittings soldered together to get the bends and sizes right.
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