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Looks like +.030 and a crower cam, 484/512 lift and all t meyer parts, hoping to be finalized this week, as well as start machine work, What torque converter stall? 6900# truck, 4x4 c6 w/low gear kit, 410gears and 255/85 tires?
I'm not a fan of high-stall converters. Your 400 should have gobs of low-end torque, so there should be no need to do anything other than a stock or maybe even a towing/RV converter. And with the low gears in the tranny and rear end you'll have lots of torque, even at your elevation.