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Ideally, you should run as much boost as possible before the A/F ratio starts going rich. I'm tuned to start going rich at 3psi. It'd be really interesting to see what your more modern engine can do.
It doesn't look like there's enough room, but if you can, put a turbo blanket on, and wrap any unshielded exhaust parts. I went from a factory heat shield, to a blanket + heat shield and it mad a huge difference in under hood temp.
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