I do agree with Ed,
You can overdrive the heck outa the 6/71 but it will heat and beat up the air a lot. It will work though.
The bigger blowers will need to spin less rpm so the air will be cleaner and cooler.
FRom what little I have learned about the High Helix Blowers is that the boost is instant and hard hitting. Maybe not what you would want.
I think they also make an interccoler style of blower intake manifold that would cool the mixture down. With alcohol that will be cooler too.
Don't forget to put a cranksaft girdle on the front to support the front of the crankshaft. That is very important.
Ed