Magnum 360 build. (HP/tq?)

I'm with GTX John. You need to put a little more cam in that motor.
Now having said that, I do think you're kicking 450 right Square in the butt with the right carburetor, as is.
I could be wrong I was once, then we discovered I was mistaken.
I'm a firm believer in, foot-pounds of torque as versus pound-feet. That's just the old fart in me.