Refurbing rear 9" drums on my '72 Demon

When car is put into drive and brake is applied the driver side turns ever so slightly but the passenger spins freely (like car is going 15mph). If I try to adjust brake any more I cant get the drum to slide on. Driver side adjuster shows 5-6 thread, passenger is bottomed out maybe 1 thread.

Are you saying with the brake pedal pushed down the wheels are turning?
Did you make sure the parking levers were in the fully released position? The shoes should contact the extensions coming out of wheel cylinder and actually push it into cylinder. Could be you have a cable or cables not operating correctly. You can go about it a couple of ways. First you could unhook the cables from the park brake lever on the brakes and see how they adjust. Or you could physically try and push against the park brake levers to see if the cable extends any more. How does the brake pedal feel when you push it? If you replaced the wheel cylinders you may still have air in the system also like stated above. Just trying to pull some more info out.