Good news on the temporary fix. I'd be all over Jon's new carb like white on rice, especially if you plan on keeping the truck for a while. A new in the box carb is a much better option than somebody's 60 year old "repairable core", especially one that's a bolt-on swap with no modifications. The next best option would be an intake and carb swap for a Quadrajet, one that's calibrated for a late-1960's or early 70's 327.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!