In the late 60's or early 70's a buddy had a 301 small block in a '66 Chevelle. The engine had a lot of bullets and hardly any manifold vacuum. He got a manual vacuum modulator for the 350 Turbo-Hydro. Instead of relying on engine vacuum to make the tranny work it was hooked up to the throttle arm on the carb. I think it was made by B&M, but a search of their website doesn't show it. Anybody got any ideas where I can find one of these? Thanks and take care. Tool Roomer