J4J1 Cobra computer in a GT????

With those mods, it should run smoother in theory with the J4J1. When I had a similar setup, I was running a tune based off the J4J1 strategy because the T4MO (CBAZA strategy) wasn't cutting it. It has a more conservative timing curve though, if I remember correctly. For the hassle and potential problems with swapping computers, I would opt for a tuner like the tweecer instead.

Well it depends on the MAF....is it tuned for a GT car or a Cobra? The MAF transfer curves will be different since the GT expects 19lb injectors and the cobra computer expects 24. Since you have a GT im gonna assume that its for a GT.

That said, its not gonna run "smoothly" since the curve isnt exact. So you'll need a tune anyway. Outside of that, even if you had a MAF for a cobra ready to run, i still feel like its gonna need to get tuned to run the best possible.

So IMHO, go straight to a custom tune. Whether or not you do it with a tweecer or you pay someone, the T4MO is fine when you tune it. I had a PMS on my 95GT that i tuned a 302 h/c/i, 351w h/c/i and now back to a 302h/c/i and it was EASY every time to get it running damn near as smooth as stock....with a nice lope . So you dont "need" the J4J1 to get these cars to run smooth.

seems like more work than it's worth...i've read people putting A9L's in the 94-95 but to try and get away from having to tune it...i'd keep what you have, if anything get a tweeker or somekthing but regardless get a real tune on the car.