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Sounds like a good general plan to me. I would suggest you go with a 90mm throttle body instead of ITB's with a large street port. The street port runs out of steam at around 7500 rpm. You are totally constrained by the stock throttle body. There are plenty of 90mm throttle bodies you can mate to the intake. You should be able to make close to 350 with that. If you want to go higher, you really want to go pport (or semi pport)and ITB's.
Gordon
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1993 Rx7 R1 20b NA
1994 Rx7 20b supercharged project
1991 BMW 850 6 speed
1991 BMW E30 M3 Evo II
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