If you are working with a BB or a Hemi then there should be plenty of room. Just buy one of those pumps and a pulley and hang it in space so the belt is straight. You'll probably have about one inch of room behind the pump for the bracket. You'll have to figure how how you want to tension the belt. Any good street rod shop should be able to fabricate a mount for you. If you are working with a G3 then mounts already exist to use this pump.