I use a GN governor always in my 200-4R's. If I was running a 3.73 gear like you I would run an 86-88 Monte SS driven gear (I forget the color off hand). A 3.42 rear then I run the Buick GN driven gear, and 3.23 I run the Turbo T/A (1989) driven gear.
Given your locale, I would go to Level 10 in North Jersey. Only a hop, skip and jump from the big city. Just don't make the same mistake I made one time by telling them I wanted number 11 on a scale of 1 to 10! Holy crap, the rear axle would literally jump off the pavement when it shifted to second! Had to tone it down a bit after the novelty wore off (about a day and a half later!)
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"Objects in mirror are closer than they appear" 