440 problems (take 2)... More known values

If it were me, I'd lose the 2800 convertor for a stock type hi stall which will be closer to 2K with what you have. The higher stall will work, but will probably higher than 2800 with those gears, and may feel soft when cruising below 3K. Depending on the tire size that could be any speed under 60mph...
On the camshaft - you have little static compression. Keep it small and you'll be happier. Less than 225° @ .050. A Comp XE268 or even 262, the Crane 680321 or 683941, Engle EP-18HYD, etc etc etc. Any of those should work with the springs you have and stamped arms - but you will probably have to measure for custom pushrods to get the preload to manufacturer's recommended. The odds of what you have for pushrods being perfect are not really that good.