I have vacuum available, but I have a pretty wild camshaft so I only have about 14" of vacuum. I believe 18-22" is ideal. Currently it's ported to the intake manifold.I would have kept it manual brakes, but Id rather buy a vacuum pump ad canister than buy a manual master cylinder and have to redo brake lines to get them to match. I was just curious if anyoe knew the function of that port on the fuse block, but now i see photobucket doesn't allow picture sharing. I'll see if i can find a better picture hosting site.