2bbl to 4bbl what kind of power increase

No cam in this motor's future. I have a built 360 waiting in the wings, but have to save up a little $$ to get the extra 8-3/4 I have rebuilt and do the brake swap and what not on it. I just haven't had a running hot rod in a VERY long time, so even if it's a little 318 Dart I still want to drive it for a bit before I rip it apart.

An intake and carb change with parts I already have doesn't involve putting any money and hardly any time into it, just wanted to see if I would get any more fun out of it or not.