Disappointing dyno results

Since you degree'd the cam and installed it straight-up (Post #46) you should be fine there. What was ignition timing for the dyno pulls? You could also try some larger metering rods to lean out the AFR a bit. Might pick up 20-40 HP with the tune but after that your small cam is definitely the limiting factor. That's the sort of cam that belongs in a heavy cruiser or tow rig application for gas mileage and low-end torque.

A cam like the stock 340 grind is good but you could get a little better, something with advertised intake duration similar to or 4-8 degrees more than the cam you have now but with more duration at .050" lift and lift closer to .470-.480" on a 108 degree lobe separation angle (LSA). You don't need to know cam specs to get a good one though, just need to talk to a good cam company that's familiar with Mopar 340 engines (like Oregon or some other smaller ones like Schneider, Racer Brown, Bullet cams). Sounds like the company you got your current one from wanted to play it safe (a little too safe) with street manners and didn't know that even the factory 340 cam was a decent bit bigger than that.