I used a 91 s10 master cylinder, it basically bolted into the rubber boot hole where the old clutch rod went, I just have a 5 speed, thats alot of shifting in my abody, but I spose with a 451, youll be able to pull 6th easy so if geared right, it is basically a 5 speed till you get to the highway. Im not sure on the ratios. Looks good