Best Gearing for 8 3/4 Behind 1970 Duster 318

I went on the maiden voyage in my 74 Duster project with a mild cammed 318/904. I put in an 8.75 with 3:55 Sure Grip amd the other day I got a chirp backing out the driveway and then after a couple trips around the block, I reved it up and laid a little patch just to let the neighbors know I was done