I suspect of 36mm port can support 250hp (my old 2.8 mfi), a 39mm should be able to support more than that.
If we set our idle and cruse AFR near 14/1 and wish 13/1 for max TQ, we need more fuel. USA Porsche CIS cars do not have an enrichment function and can go to 17/1 AFR on first accel. This is part of the reason along with the low compression why CIS is not know for its throttle response.
Set CR to 10.5, lower control pressure with accel so the metering plate starts moving so we get in instant 13/1 AFR on top of twin plug ignition and it will wake CIS up.
It may not match a well set up carb but there is potential there.
At least that is my believe.
