Best Gearing for 8 3/4 Behind 1970 Duster 318

3.55 is my preference. Had a 318 with a 68 340 cam and 70 Sixpack hooked to a 727 with a 2800 stall. 14mpg around town, 18 on the highway. Oh yeah, that was in the little old 69 Fury ragtop that I had for 17 years.