Being a short duration cam, and also a hydraulic, you can simply rotate the crank until each piston is at TDC (firing stroke of course) and tighten it's rockers there. 18436572 is the GM firing order for you Mopar guys!
An easy way is to rotate the pushrod between your index finger and thumb while tightening the rocker nut down until the clearance has been taken up and you are unable to rotate the pushrod. (Make sure that the pushrod is located properly in the seat of the lifter.) Stop tightening, then give a 1/2 or 3/4 turn clockwise of preload and lock the rocker nut there. (I hope you are using posi-locks or brand new
GM sourced crimped locking nuts. Used OE lock nuts are not recomended by me -from experience.)
Some people prefer 1/4 turn, some 1/2, 3/4 or even a whole turn of preload. It really doesn't matter and if you like, go to the cam supplier and see what they recomend.
There is a tiny difference between each preference in rocker geometry and even duration, but it's splitting hairs and not really worth the consideration of deciding which is best for this application.
Personally, I like 3/4.