66 8 lug c20 eaton swap

[handsomedevil66]

hey guys ,
not sure if there is another thread on this, so i thought i would ask
I have a 1966 chevy c20 with the eaton ho52 and want to swap the rear end
with something that will be more freeway friendly as this is my daily driver
what rear ends should i be looking for id like to stay away from 5 lug and keep the 8 lug if possible, ive talked to a rear end specialist and he told me the gears are not out there i would have to swap the rear end , any responses would be greatly appreciated , 350/350 power plant if that helps and i do plan on bagging the truck
thanks in advance for the help