I know somebody that bought a brand new 340 Demon with auto and 3.91's. All they did, and ALL they did was bolt slicks on it and it ran 14.20's factory bone stock with zero spin. But that isn't 13.9's. And that's not with 2.94's. lol
I do plan on getting over 300 hp (flywheel) out of the 5.2, but it will never be dyno'd to prove anything. Biggest thing is to get the car to move with 2.94's and a stock converter.