Now, for a contrarian viewpoint, my 447 cubes, with my old school solid flat tappet cam, absolutely positively loves my 750 vacuum secondary, which I have significantly tweaked and massaged over the last 15 years. Now, my rev limiter is set at 6400 RPM and I probably bounce off it once every couple of years. I love that carb, but that's probably because I've known it for so long now and have tweaked all its weak points.
