[Chevy454]

Good score! A much needed improvement over the 305!! Is your current tranny (350TH) good? If so, I'd stick with it, as a stock 400 is overkill for your combo, and a built 400 is REALLY gonna be overkill. In fact, you'll LOSE some ponies by going with a stock 400TH over a 350TH, and a built 400TH is REALLY gonna eat some power. Sell that 400TH and recoup some of your money...