Make sure you back off the adjusters as far as they will go. If it still won't come off, disconnect the brake line and remove the mounting bolts for the wheel cylinders. This should allow the brake shoes, Springs and brake cylinders to move enough to get the drums off. I don't believe the holes are threaded.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)