need help! I don't know nothin' about gears!

I had the same issue when I upgraded cam, headers, carb etc on my car. I picked up an 8 3/4 rear, used clutch type suregrip and some new 3.55 gears.

I rebuilt the rear entirely and shoved it under the car and man what a difference, I still need a converter. That will probably wait until I get my new engine together so I can have one made for my application.