Back in the day when 2- WD were the life of the farm operation it seems every winter or maybe every other year one or both would get a fresh overhaul(maybe valves & rings & Rod bearings) when we put gaskets on we would put sealant on the cover(Permatex Form-A-Gasket) and then fasten the gasket on the tacky cover with little c-clips made out of small wire. After the cover was placed on the engine & snugged down the little clips were pulled out with a pliers. We did that on oil pans and any gasket that needed a little help keeping in place. Usually 24 hours waiting time wasn't an option. I grew up thinking that everyone did it that way but hearing all the methods maybe not.
Not sure why my Dad did it but often he would take the valve cover off and adjust the tappets by sound with the engine running after it warmed up even though we had them close to spec's with feeler gauges ? A kid learned a lot of things back in the "day" and maybe some weren't all correct. Cursing was right at the top of the list.Cleddy