If it has 4.10 gears, all of a 13500 gcwr. If 4.56 gears, around 16K total. That is a throttle body setup, ie an electronic 2 bbl carburetor setup. Better than a true 2bbl setup, not as good as a iirc, 95 or 96 vortec 350.....but gets the job done.
If it has a 4 or 5 sp manual, I would go for it to a point. If a TH400, bypass really quick!
RA is 7500 lbs, front around 3800-4000 capacity.
I do have some wants for my 96 SW K3500 I had. I like that body design etc over the 2000+ ones......that is me. If you go that old, try to get a 96 or newer with the vortec/multiport fuel injection option. Then a 350 is 255/330 or so for specs. I have this with my 2000 C2500, every bit as strong or stronger than a TBI454!
Marty