The B&M holeshot 2400 is better than stock but not by a whole lot. It will work just fine with the Howard’s cam Garrett suggested, the RPM intake, and the manifolds. As well as your intended purpose for the truck. If you decide you want to race the truck and really make it work a custom converter is money well spent. But not until then.
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.