Whats your impression of a 5.3L LS motor in these trucks?

[SweetandLong68]

Hey guys. I was pondering on my new engine/tranny for my truck. This will be my daily driver so I need something will some power but also get decent mileage. My first thought was the 5.3L with 4L60E just because they are plentiful and cheap. But really want a LQ9 6.0L. Just wondering what you guys impressions are with these trucks and the 5.3L, good enough, pleanty of power, mileage? Stuff like that.

BTW this will be going in my 68 SWB C-10. Has a 4.10 gear in it now but I have a set of 3.55s as well.

thanks
CHRIS