The first thing that you can do to that motor is put a bigger cam in it. They come undercammed and that should make a sizeable difference. I would look at someting like the comp cams XR288HR 236 242 dur @.050, .521 .540 lift powerband 2500-6000. your motor already has a roller cam in it, so the lifters can be used on whatever cam you decide to buy as long as its a roller. Air gap is also a realy good idea. I would also try 1.7 rockers.