What year 5.3?

[KMC3420]

I have been doing lots of research on swapping a 5.3 into my 72. I am going to get my engine from the local salvage yard. I am needing info on what is the best year(s) of the 5.3 that I should have them look for? I understand the DBW vs DBC, DBC seems to be what most guys have. So what year should I have them look for, and what is considered low mileage on a 5.3 as I have never owned one? I have already purchased dirty dingo sliders, as well as the CPP sheet metal perches. Thanks for any info.