Top End Needed

I will be very surprised if you see much of an improvement. Many people forget that a dual plane splits the carb in half, so on a single plane you have the 750 feeding each cylinder, same carb on a dual plane you've got a 375 cfm carb in effect. We've found in Dyno testing that a basic 360 that makes peak power at 6400-6500 RPM will use up a 825 Demon or 850 DP Holley with a 2" open spacer.
We're hoping to try a Dominator on a friends 318 stroker with an Air Gap & Edelbrock heads, from memory he has a 950HP on it now.