What donor 350 truck to use?

[dcody619]

I've been looking at used trucks with 350's in them? But I'm not really sure what are the best years to look at as donors for 58 1/2 ton stepside. If I can use some of the suspension parts that would be great too but not my priority. I don't know anything about chevy trannys so a crash course would help.

I'm looking for something reliable and not to difficult to work on. Not looking to get massive hp out of it just a good daily driver.

PS What's the 2 bolt and 4 bolt blocks?

Thanks much!