I've looked on the internet and I can't find a good source for a answer on my question on how compression ratio to use on an all out drag race BB Mopar Wedge motor (551 C.I. B1-MC heads with EFI) using a VA-130-123A Vortech super charger
Any help on where to look or on how to a get a reliable answer to this question will be greatly appreciated
Thanks in advance: bow:

10- 10.5 to 1 is a good safe starting point. People run higher but it narrows your tuning window. Also EFI and E85 does not provide as much cooling effect as blow-through carb on the charge air. If you are building your intake mount the injector bungs as high in the runner as possible to gain some charge air cooling. You could run 12-12.5 to 1 on methanol and not worry about any of it.

Get performance trends engine analyzer, it will generate an advance curve with various fuels including alcohol. For example I just used it on the dyno with a 512 mopar, with Holley electronic fuel injection. The Holley stock timing maps basically go to full advance after 2,500rpm. Engine did not like that much advance on the dyno. Plugged engine into the program, generated advance curve, used that curve into the Holley computer timing map and it made 615 ft. lbs torque and 515 HP I have done this multiple times with various engines including supercharged engines, it is easy and it really works. On my dyno anyway the predicted timing curve is usually a couple degrees from the max HP on the first pull.