I would suggest a manual: for example: https://www.classicparts.com/1956-6...oga_6QRcPLCYio9T_QFzlwsTq98aAj_REALw_wcB
Actually there are about 3-4 manuals ( 2 service, one parts; and a "PowerPak install manual). Just do a search on "chevy napco manuals"

If it is the thread bearing adjusting nut you are questioning, it is " As tight as possible and back off 1/6 turn" as per the manual. They specify a special tool, but you can figure something out.
don