Well, after reading all this I thought about the clock in my 67 Impala (the chevelle isn't running right now but its clock doesn't work either). So, I went to the clock repair sites I had bookmarked to price things out and the prices listed above seem typical. I asked my wife if she wanted a working clock for 90 bucks and she said no way. BUT
on the Tachman site was a little info about the type of clocks used and why they go bad. Usually it is due to bad or no lubrication and sometimes a voltage spike. I thought hey, I can fix a bad lube job so last night I took the clock out, disassembled it and sure enough it wouldn't turn due to hardend lubre.
After liberal doses of starting fluid it now works great! I finished the job with some graphite and ultrafine gear oil. After all what did I have to lose?