Newbie 360 info

Stock 8 1/4 rear probably 2.76 ish

Stock converter?

If so I can tell you from experience you won't be happy. It needs a converter specifically built for your combination AND you will want at a minimum 3.23's, I would go 3.55's.

I had stock converter and 2.76's and it was an absolute pig outta the hole. Once you got into the power band it took off pretty good.