I'm going to throw my $.02 in here. Both Jon and Jerry are correct, and are giving very good advice on what to keep in mind with carburation and effects on the engine performance when you start messing with it. Now for my part, I looked at some of your other posts, I see you have a '59. You will find that a triple intake will have clearance issues at the rear carb, as the engine does sit back into a recess in the firewall. The rear intake port is almost directly in line with the edge of the recess, right where the third carb will sit. This was something I looked in to, as I had considered 3 carbs on mine. If you are set on multiple carbs, you might consider duals instead, and follow Jon and Jerrys advice on setup.
