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Or just modify your old transmission to take more modern converters:
http://www.hotrod.com/articles/mopp-0807-transmission-torque-converter/
All you'd really need would be the crank. They fit a 340 block. You just missed one (by a couple of years) http://www.ebay.com/itm/340-Mopar-De-stroker-Crankshaft-Forged-Steel-/261028254805
If you could get a custom 2.96 stroke crank you'd still be looking for the custom rods and pistons for...
The first thing I would do would be to pull the speedometer cable and lube it, try again. If the cable is the cause of the jumping, your next speedometer will have the same problem.