While the tag does say "high stall" many converter rebuilders call it a medium stall converter. The information I've got (or received) says that it stalls between 2200-2400. This converter has been used behind many engines: /6, 318, 383, 400, and the 360 and 440 engines with a forged crank. With this many engine combinations, the stall will vary depending on what engine it is behind, and other governing factors. I would tend to agree that with what your engine is now, you will might see in the 2700/2800 range on a flash stall, and depending on the holding power of your brakes in the area of 2400.
If your entertaining buying a high stall converter down the road, don't order it until you've got your engine, diff., and rear tire size combination figured out.