yea replace the air filter to bmc race, do the pair, tre, remove the stv rod and plates then fill the holes and sand them smooth, change the plugs, throw a full system on there then change all 4 stacks to 750 short stacks then go to a dyno and get it turned especially for the stacks and STV mod and you should get some good results

and if your feeling generous then donate some web 540 cams and set them to 105/107 for best power or 103/017 .. also while your at it change the CCT to a manual one b/c the teeth on the automatic one usually wear out..