I have an 87 C4. It has a brand-new Blueprint CT396 engine in it. Jim Hall from TPIS has made a new mini ram for it. I have it installed, and it is scary fast but running poorly. Blueprint says it needs a healthy tune. Jim Hall says the stock OBD1 system can be successfully tuned with a new chip to run well. I have spoken to two other local tuners, one says he can burn and dyno a new chip on the old system, the other calls the 87 computer nothing more than a paperweight of old junk. He is insisting I consider a F.A.S.T. or Holley software kit addition. I am looking for input from anyone who has been down this path before me, and to hear your successes with EFI/TPIS engines that are pushing 500 HP without boost/nitros/etc.... Presently it won't idle and is running very rich. It has a modified chip in it from an old tuner, who has sadly retired, but that was for a stock 350 with a hi-flo Edelbrock intake. Not even close to the new engine. Thanks in advance!