Finally was able to get back to this this weekend.
The compressor is running now, but I'm almost back to my original problem.
As I mentioned, the car has been converted to R-134, and with the car turned off, the pressures at both the high side and the low side @ ~95...
With the compressor running, it climbs to about 105 on both the high and low side, and still no cooling.
So, I'm thinking it's a bad expansion valve, and if not that, a bad compressor.
Any thoughts??

Is the expansion valve located right next to the driver's side top shock mount?? And last, would (should) an expansion valve be different for an R-12 system and a R-134 system.... The compressor manifold and accumulator look like they were replaced when the system was upgraded a couple of years ago, but I'm not sure on the expansion valve...
Thanks for your help.

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Barry