well, first, what pipes do you have to start with? x2 on getting with a builder. make a long-term plan, and base upgrades choices on that. for instance, you can have your head worked for cheaper than a cool-head, but it may be better to get a cool-head if you plan on stroking, or changing compression later, ignition, clutch, tranny options, etc........ an override is good for drag, verry good, actually, but there are several different types, and if you are riding off the strip, you could blow it up just from back-loading...