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+1 on doing the smaller underdrive pulley (requires a shorter belt, btw) AND the front motor mount. You'll notice a nice bump in HP from your butt dyno and the front motor mount swap will make shifting easier as well as eliminate any annoying vibration you get at 3000 rpm or thereabouts.
I just had these things replaced on my car along with a low temp thermostat and a new water pump (old one looked and worked fine, but it was at the right age for a failure) and I'm very pleased with the results.
Do note that installing the smaller underdrive pulley will require you to grind off part of a positioning race on the engine block that gets in the way of the smaller pulley.
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