Are they stud centered BUDD wheels?
If so the drivers side should be left hand thread, try turning them clockwise.
Also look on the end of the inner nut for an "L" or an "R" sometimes they'll give you a little clue like that.

If you've really overtightened them you may be in for some new studs and nuts and inspect the holes in the wheels carefully.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-