Turbo slant six post
Yep, I'm the one who bought it. Something was wrong with the four barrel by the time I got it (or maybe we'd set it up very differently), resulting in some fueling issues that I couldn't straighten out. So I went to EFI. Unfortunately the turbo was way too small for a free flowing intake like the one I'd put together; what worked OK with a one barrel Holley has issues when I tried to use it with a 65 mm throttle body. Now I'm busy putting a bigger turbo (and a trunk mounted battery, 100 amp alternator, intercooler...) on it.
The Holset turbos off turbo diesels could probably give you the same results on a stocker and allow a bit more room to grow.