77 aspen
360 600 holley,edelbrock torker manifold,stock 340 exhaust,edelbrock cam,727 tranny,b&m 11"holeshot converter,b&m transpak,b&m prostick shifter,8 1/4 rearend with a not so good suregrip
my 77 aspen has a 8 1/4 3:23 suregrip but the sure grip is bad,my son has a 8 3/4 with no gears that i can have,should i fix the 8 1/4 or go with the 8 3/4? wanna put some lower gears in either one. thanks