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You may have already correctly diagnosed your problem, but I had a problem before with a '67 Duetto that manifested itself very similarly to your problem. It felt like the driveshaft had fallen off and might be wiggling around on the pavement. Try taking off the rear disks and making sure that the handbrake springs and pins are intact and properly positioned. It turned out for me that the internals of the handbrake assembly in the driver's side rear disk had broken and were "swimming" around in the handbrake drum and binding up from time to time. It was a mess, but after replacing the components, the problem was gone. Might be worth a look.
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