I was running a 71mm wheel with my old setup. It consisted of running 225cc/100% over injectors, and a single high pressure oil pump. It was also a 66mm, but had an .80ar housing. In the video I shot just minutes before the engine seized, you can see that it had 75-80psi drive pressure.
The spool up on this 63/68/70 is wicked fast, but it can't get rid of the pressure at wot.
And now, my injectors are 285cc 150% over, and I have added a second high pressure oil pump...
I just picked up a 66/73/70 from Spencer.
Gonna put the BD Diverter valve Back in with it, and see how it goes.
If its a slug, I might swap in the billet 63mm compressor wheel and race cover.