Gearing depends a lot on how the car is cammed and what the induction is
My son’s 86 ragtop has a mostly stock 86 HO with a VM1 ECU and it’s turned up. It’s geared with 2.95:1 low, 0.63:1 5th T5Z with 2.73’s. It runs under 1500 at 70 and gets between 29 and 32 mpg cruising down the freeway.
While you have to be hard on the clutch to launch it properly, it can run in the 13’s and it will go WAY faster than anyone should ever drive.
It just depends upon what you want to do with your car.
My 85 Saleen build is using a Gforce kit with 2.95/0.59 and 3.55 rear gears. Party time 1-4, cruise in 5th at the same RPM a 3.08 0.68 car ran from the factory.
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