904 Converter? Stock stall with 350lbft torque?

Thanks, I will weld on the balance weights if I use it. Trying to figure out if it'll be 2200+, or still lower?

To clarify, the 350lbft should be around 2000 rpm, it'll peak at about 425lbft into the powerband.
I understand that the stall rpm will increase with more torque / resistance applied, but was hoping someone might know what the upper range of these stock converters are?

Did they ever do a 904 with this converter behind a HP 440?