I'm pretty sure the 20B weighs more than a LS7, since a fully dressed REW weighs about as much as an LS1. Although, aluminum plates should offset it some.
Either way, it would be way cooler with a 20B
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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.