so I have a 04 avalanche that's coming up on 295k with the original motor and trans. the motor is burning oil and coolant so iv been trying to figure out a path to take. I'm getting my trans rebuilt while I fix the body and I was tossing around the idea of putting a 6.0 in it, but after reading most people are saying if your not planning on modding it then the swap is a waste and just do stuff to the 5.3. this truck is my dd, it rarely tows because iv got 2 powerstrokes, so my issue is do I drop in the 6.0, issue there is im obviously gonna buy a used one SSL that means I don't know what im getting, if I build the 5.3 obviously I'm gonna need heads and while there I'd do all new bearings and probably pistons and maybe a mild cam and headers because the truck definitely needs a bit more power. so what would you guys do