if you put gx head with its twin carbs on your a15, how much HP will you think it will make?

90ish?

The larger ports will allow more gas flow, but the GX valves are smaller than the A15 valves, so you loose what you might have gained because of this.

The A15 head is very well suited to the A15 engine for almost any application except 'balls to the wall' race engines, however with suitable mods, they will serve well in this application too.

A modified A12GX head has more potential in a race engine, but again, really only in an all out engine.

to answer DDGonzal, i have the rear end off of a B210 and a Dogleg transmission out of the B210GX, so i dont think i will be breaking anything

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You should have no problems with that setup but I went a step further with the A15 supercharged/nitrous and the lock rearend. Went through both the H150 and H165 rearends before blowing the motor. The only thing that lasted was the 5 speed tranny. I wish I would have had the motor dyno'd when it was at its peak performance but if I had to take a guess, I was probably pushing 120hp. Maybe a bit more. The A15 was pushed to its limits. I was sorry to see it go.