I agree, you'll want to run a shorter gear than the 3.50, especially with those big meats...

making a few assumptions (car wt ~3000lbs, 460 real HP to rear wheels) and also assuming the coupe is built for 1/4mi bracket racing + cruising, the car should run somewhere around 11.0@125mph in a 1/4mi.

If these assumptions are close, a 4.33:1 gear will put you through the traps at 5900rpm at 125mph in 3rd gear (4.10 gear at same rpm 133mph). With that same 4.33 gear you will cruise at 75mph at a comfortable 2700rpm in 3rd+overdrive

If actual hp to the pavement is less, you'll want an even shorter gear (and/or shorter tire)... 4.56 probably about right, 4.88 probably overkill....

two cents,

Chris