The OP has a older 350 chevy so other brands/gears/transmissions don't apply here. I believe he has already received his answer many time over.
Anyhow.... now his question is what brand tires and which load range.
I've used LT E tires on a couple of 1500 trucks some years ago but always went back to a C load range or a 44 psi rated P tire.
If the truck isn't driven in snow/icey/off road a good all season (AS) tire will work.
All of my trucks see this type of driving so I keep a good all terrain (AT) tire on them.
I'm not a brand fan and have used Bridgestones/Michelins/Cooper/Goodyear/Uniroyals/Delta/BFGoodrich/Firestone P and LT tires on my various 1/2...3/4 .....and one ton trucks over the years. Each tire brand has several tire type to choose from. Check out the tirerack.com for brands/sizes/load ranges/tread types availability and prices.