So after the question posed by RustyDollars, here is a walkthrough of the burners I build. I have a few of these floating around, and prefer the side input vs rear input since it lessens the stress caused by that extra weight hanging off the back of the assembly, and lets me have a quick choke setup that's pain-free.
https://youtu.be/xeDwTAuPtso
What do your burner setups look like?