heya have a 5.0 with mild HCI (thumper b-cam combo and i am looking for more power. with such a mild combo should i just be looking to get on a dyno and manually tinker with FP, and timing for maximum power?? i may be getting a SC soon i am not sure but then would i need to get a nice dyno computer tune? or could i still manually tinker with it myself?? also how do the dyno chip deals work, is it just come software a dyno man has and after you make runs and stuff he burns a chip that piggybacks into your computer?? and how much does that cost usually ( a ballpark guess) and how much are the handheld tuners and do they work well and are they worth the price??? also i have a painless wiring injector harness, the car is a 91 gt, and this harness is just the engine harness i think, its all the stuff that plugs into the salt and pepper shakers, the injectors and stuff like that, it also controls my ignition, as my spout is relocated under the dash right by the computer ( and the stock harness is tucked back in the engine bay. i also think it controls my MAF and stuff, and it also has its own connectors for taking engine codes. would this present any problems to a dyno tuner or a handheld unit??