i had a 82 3/4 ton long box chevy with a 350 4 barrel, toghest truck ever, i got it stuck once and the buddy that pulled me out didnt know when to stop he thought it was great that his ford was pulling my bowtie, so i started to pull back, no big deal but he has a 97 3/4 ton ford with a powerstoke diesel,pulled that diesel around like a tonka toy, surprising as it is its true. my truck had 210000 miles on it and a rebuilt tranny and tranfer case and thats all, it was the toughest truck i have evr drove, in my opion an old chevy is the best for what ur askig with out a lot of heartbreak when u beat it up, but as a few guys said b-4 the 4.3 liter v-6 is a durable engine that will last a long time, they put those in lil s-10's, they r light and real tough,
but all in all ur question is just a personal preference, thats all, some people have better luck with one vehicle while another has the same make model and year and they blow everything up,
ohh, i have a 99 1/2 ton chevy with a 5.3 liter and have 115000 on it and havent replaced anything on it, it is my beater up now, not a tranny eating maniac like the mopar is lol sry to u mopar fans but it is true,