If you want to do the math this is the web site with the formulas you need
http://www.golenengineservice.com/html/calculators.html .
most of the Top Sportsman gears I have set up are 4:33. but most use nitros so do the math and don't overestimate the rpm potential of that 632.
I would gear the car fo the quarter because if you add more gear for the 1/8 mile you will lose some consistency.
Good luck