I would say a lot. One huge part of 1/4 mile is early acceleration. Gears make a big difference in launching. 3.31 are not going to transfer near as much torque as 3.73's.
Chevy runs deep, don't step in Chevy.
chevy runs deep, Don't step in chevy!
67 Coupe 289 - TCI C4 w/2k stall; Holley 4150 570cfm; Performer intake; mild cam; Pertronix HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.