Thanks guys for the replies. I'm sorry that I didn't give more details in the original post.
The car is for drag racing only. All of my racing will be 1/8 mile. I will be using nitrous in the future. The 8" converter is for HP runs and I have a 9" for nitrous runs. Steve O. and BTE both agreed that this converter would work great on HP. My peak torque should be right around 5500 RPM.
As for the camshaft, I selected something that would work with the natural RPM range of the rectangle port heads -- 5500 to 7500 RPM. I chose the big lift to get as much curtain area flow as possible to help with the velocity of the big ports. I have a 4340 crank & rods w/ L19 bolts, so the high RPM shouldn't be a problem.
I have decided to go with the PG. The 4.30 gear should work well on the bottle. I may build another center section and try a steeper gear like a 5.14 or 5.29 for HP runs. This would allow me to have a gear and converter set-up to run HP or nitrous. I don't plan on spraying a ton on it, around 250 HP or less.