[spacemanspif]

Are you in NYC or some other city in NY? Is a bicycle or bus out of the question?

F-bodies usually came from the factory with 3.20-ish gears I think: light weight, good aero, and good power enabled GM to run tall-ish gears to squeeze out a little better highway mpg. For city driving a rear ratio change won't help much. Plenty of heat under the hood, make up an adjustable WAI and monitor temps on a scangauge. Most exhaust manifolds sucked before 1990 but I'm not sure if the LT1 manifolds perform like other SBC manifolds of the past or if they were a shorty design like the LS1 manifolds, so gains could possibly be made by switching to headers. For Stop and go driving, weight reduction can help so you need less power to take off.

Best way to save gas is by not burning any but EOC and the 4l60e are probably not going to play well together.