rangerd, 1st off Welcome to Stovebolt! wave Guessing you aren't interested in adding extra holes to your Offy valve cover just in the interest of adding a port for a PCV valve??? If so, you may want to locate (or fabricate) and install a PCV setup that uses the draft tube and intake manifold ports on your 235 as you can see was available as an RPO option in the extract below from the 1955-59 Truck Factory Assembly Manual.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)