What rear end gears for 904?

I'm at odds with what rear end gear to run in my Duster. The engine is a 360 with a 268XE cam with aluminum eddy RPM heads, aluminum RPM intake, 750 Holley Double Pumper, and produces about 400hp on the motor. Rear end is a built 8 1/4. A 100 shot of NOS is also in the plan.

The trans is a 904 with a 2400 stall and a shift kit. Tire size is 28" tall (275/60/15).

The car is primarily designed to be a street brawler with occasional interstate use and an occasionally a trip to the strip.

I'm curious how a 3.55 gear would perform (i.e launch, cruise, and mid range pickup) versus a 3.73. Which gear will perform better with the NOS? I don't care about gas mileage I'm all about the fun factor and butt kicking factor on the street.