What gears r best 4 my set up?

I have a 1985 s10 blazer with a 355 in it 600 carb turbo 350 trans with a mile converter mild cam and a100 shot of nos i just bought the truck and it has a nice set up my problem is that it has 4:10 gears i will be taking it to the track once in a while but more street than strip it has a eaton locker which im fine with but i cant seem to go pass 55 whithout it felling funny i want to be able to take it on the hwy and do normal speed i have famaly hrs away and want to take my truk to enjoy it hope i gave ya enoght info what gears do i go with my name is gil im under my wife account