Mike,
I will throw out another idea. If you are trying to build the ultimate VF4 Street roadster rear end. I would suggest using a stock early ford. Am I crazy? Maybe, but hear me out. A rear end that has it's pinion intersect at 90 degrees to the ring gear IMO is the most efficient rear end you can use. Gearsets of 3.27, 3.54, 3.78, and 4.11 can be obtained for an early ford rearend. You can run tire diameters from 22", 23", 24", 25", 26", 27", and 28" for drive tires. By doing this you would have a rear end that IMO takes the least amout of HP to drive, thereby getting more of the engines HP to the ground.
Example: 3.54 gear with 24" tall tire @5000rpm = 101mph.
" " " " 25" " " " 105mph.
Example: 3.78 gear with 26" tall tire @5000rpm = 102mph.
28" 110mph
Good luck,
Tom G.