440 what am I missing here?

It depends on if the OP is willing to add headers and change the converter, too. The XR274HR has an intake closing of 38 ABDC and yields a cranking pressure of 198 PSI under the same conditions. I could see this cam running out of breath at the advertised 5800 rpm, but, if it’s installed 4 degrees retarded (110 ICL from 106) then it would easily pull past 6000 rpm and should still play nicely with the 2000 rpm stall. This would still yield 194 psi cranking.
The next step up is the 230/236 XR280HR with an rpm rating of 2200-6000 and an intake closing of 41 ABDC. That yields 196 psi cranking. Comp recommends 10.5:1 and 3.91 gears with a 2800 stall. If the OP is going to add headers and wanting to swap to a converters (custom built to the cam, gear, and vehicle weight would be best) and maximize the rpm through the midrange to the 6000 rpm peak then this cam would fit the bill. If you wanted to advance this cam 4 degrees, you’d be looking at 199 psi cranking.
As far as headers go, have you looked at any of the over the counter options for the later trucks?