440 what am I missing here?

2400 is like a 440 high stall. That's a lotta cam for a 2400 converter. Why does it have to be a race truck for a custom converter? Street cars IMO benefit much more from a custom converter. With a race car, it's nowhere near as important how tight it is at low RPM.
I kinda agree with you. I just meant that how badly his combo is mis matched now he has bigger fish to fry than worry about his converter. Get the engine combo sorted out for the intended use and his converter will likely be just fine.