bigger carb 1050 set of 2 1/8or 2 1/4 headers more cr about two points or more bigger cam something like 268 279 @ 050 on 108 714/710 or around there bigger heads 325/330 cc runners super vic intake . to use what you have now bigger carb and a wee bit more stall any thing more then that you will be running over the heads and cam so not much more gear . first thing inside the engine is $hit cam that hyd cam and move up to a soild roller they work fine on the street if you use hippo lifters you can not go nuts on the dur with low ch will be a dog down low could try a 112 lsa and more lift in the 650 255/260 @ 050