f16 gearbox help asap

[fastcar1cars]

hi all currently looking for a f16 close ratio box to go onto a c20xe nova!!
found one with a code c372! so is it cose ratio with a final drive of 3.72?
is this any good or would a c355 be better as i keep reading of them??
any help would be brilliant!!
cheers

[fastcar1cars]

jus found this

"basically the lower the FD number the higher your potential top speed (for a given gear) but you accelerate slower, and conversely the higher the number, the lower your potential top speed (for the same given gear(s)) but you accelerate much faster."

so i think this box will be perfect for acceleration!!