66GMC - It was a ground issue. I installed new rubber bushings under the rad support - no ground to the support with the rest of the front clip off. I ran a ground strap from the battery to the rad support - problem fixed. I have 13.98 volts at an idle. Still no "Gen" light. I checked the bulb and it does work. The printed circuit on the back of the instrument cluster looks a little frazzled? I removed the dash pad to access the bulb and have limited access - I'll have to pull the instrument cluster and see if there is a bad spot in the circuit.
EOD Guy - I was thinking the same thing - read a bunch of threads about the swap ast night and was planning to do just that if I could not solve the problem. It's definitely going to happen the next time the alternator/regulator gives me any trouble.
Thanks guys for the replies - very much appreciated!