8 3/4 rear engine dragster gear ratio

Only been around that type of car in the 1/4, but i'll make some wild assumptions. :)

8.70 @ 150 roughly converts to 5.50 @ 123. that's gonna take a mid 5 gear with a 31/32" tire.

It'll take a little over 500 hp to run that #.

Imo, probably could use a little more carb & converter to be all out if your peaking in the 7k ish range.