Ok, so there's no chip

Every time i read something about these P71s, i hear conflicting info. I've deduced there is no chip, the only performance variables are the axle ratios and the year(the newer, the more power, from the factory). So, what is the best chip to buy for a 99 P71 with a 355 posi rear with 103,500 on the odo? I dont want to fry the motor, thats why i havent upgraded to high end plugs or an MSD ignition. Any thoughts, let me know, thanks Tyler Viher of TVCustoms

http://www.blueovalchips.com/
http://www.adtr.net/

These 2 sites are trust by w whole community of CV enthusiasts