I absolutely disagree and here's why. A 2500 converter is what the factory stock 340 came with. The factory high stall was used behind most if not all 340s and a LOT of other vehicles, too. The factory standard (low) stall rating for Chrysler was around 1200-1500 RPM. Chrysler knew the higher stall would help get the vehicle moving quicker.
The factory high stall was always "around" 1000 RPM higher than the low or standard stall. That's not very much for anything hotter than a stock 340. A 2500 would be the last converter I would ever recommend.
I would recommend something in the neighborhood of 3000-3800 with the gears the OP has suggested, and more with 4 series gears. All this of course is considering a camshaft with the needs of a converter like that. Converter technology has come light years ahead of the muscle car era. You can have a converter custom made to flash to 5000 RPM and yet be tight enough to drive everyday on the street with minimal slippage. Things just ain't how they used to be.