New guy here looking for a little advice. I've got a generation VI 454 crate engine with hydraulic cam and litters on a tbi setup. It's got the peanut heads and such. It's going into a 1989 k3500 with manual 4 speed Muncie and 4:10 rear-end. It's going to be used primarily for pulling a trailer with cattle, hay, cedar posts, and ranch stuff. I'm going to put some shorty headers and a cam in it but other than that I'd like to keep it stock. What size cam I get that will give me a little more low end grunt and maybe a tad more horses with a nice lope at idle? I don't want to really mess with the heads right now that's in the future. Just a cam and lifter setup. Oh and the rocker arms are the non adjustable kind which I'd like to keep it possible but not a deal breaker if not. Thanks for any advice