I have friend fixing up a 72 gj40 real nicely. Onyl thing it will need is a lift. I would love 35's but i want to know how that stock F engine will do with those. i had a 72 early with 31's. What will highway speeds be with 35's and 33's. i know i'd do a 4 inch lift but what would be better 35's or 33's???