Sorry for the late reply.. as I see it’s been a few months...
I have built my 98 Sierra for towing... I pull over 7k plus.. trailer weighs 5k, 600lbs water, quad over 500lbs, extra 25gallins gas, 2 Rottweilers, wife, gear ect...
383 Stroker, 750cfm Carb (tried efi.. left me stranded & towed...