Holy crap, that is awesome.
TitaniumTT may be able to help you out with the turbo stuff, he has a 13B-RE running the twins sequentially. Not sure about the similarities between 20B twins and 13B twins, but it's worth a shot.
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-Ted
-1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status.
-1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.
