I'm about to make this jump I think!
As I see it the biggest thing about the van turbo is the exhaust housing. It's non wastegated with a 1.15 A/R that helps reduce back pressure. The more fuel you have, the more exhaust there is and it's easier to overspin the smaller .84 housing. The reduction in BP will help save rods and head gaskets. It just may not spool as fast as a BB.
Bean almost has me sold on it.

I plan on a Stealth pump and he said the van turbo will make more HP than my stocker. Maybe I'll dyno before and after the swap.