[rocketraider]

Best way is to use a brake adjustment gage. Looks kinda like a giant pair of calipers with sliding jaws that can measure inside and outside diameter. Measure the inside diameter of the drum with the internal diameter jaws. Then lock the tool in position and put the outside diameter set of jaws over the outside of the shoes at widest point. Adjust the shoes outward to contact them. The shoes will then be adjusted perfectly to the diameter of the drum. You can pick these up cheap off a tool trailer at swap meets. I've seen them at Advance Auto too, but about twice what you'll pay at the swap meet.

If you can't get the tool easy, gearhead's method works good.

Just making sure- you replaced all the hoses too? how about the steel lines? Sometimes a hose will collapse inside, not let fluid backflow to the master cylinder and cause a wheel to drag. We had a master cylinder on a 66 Starfire that had a blocked return port and made all 4 wheels lock up.