If you have Facebook there is a Gen 5 3.0 Whipple Terminators group. I've been following and looks like those who are keeping the motor stock are around 21psi and 750-800hp 650-700 tq.
Personally, with this blower I think at a minimum a little motor work and e85 or fuel additive is needed to use this blower. Otherwise I'd recommend the VMP Gen3R or 2.3L if you can find one. Just my opinion.
Your, tune, fuel selection, and risk factor are the only things that matter. You can make 900rwhp on the stock motor while living to see another day, and the 3.0 can get you there.
Personally, with this blower I think at a minimum a little motor work and e85 or fuel additive is needed to use this blower. Otherwise I'd recommend the VMP Gen3R or 2.3L if you can find one. Just my opinion.