383 with 906 heads. Pump gas for now but I plan on running e85 once I get the flex fuel sensor figured out. I believe they are gt45 turbos. I don't need to be making too much boost. 10 lbs. is probably the limit. Cam is around a .515 lift solid flat tappet. I would think the compression is around 9-1. Log style exhaust manifold I put together with intentions of building another set. They work although I think they contribute to turbo lag when I launch the car. Some of that may be in the tuning also. Once the boost comes in its a different animal.