Topic: Oil canister 216 to 235 swap

"all filters were dealer upsells, not installed at the assembly line"
That is/was not the case for oil filters.
http://chevy.oldcarmanualproject.com/chevyresto/49100.htm

RPO-237 Oil Filter (RPOs were factory installed - Regular Production Options).
Chevrolet Truck GM-accessory oil filters came with "rubber"/flexible lines" (dealer, shop, or owner/neighbor installed).
https://www.stovebolt.com/techtips/engines/oil%20filters/index.html

I have never had a problem with original-style Chevrolet truck oil filter "rubber"/flexible lines" (proper length; and, proper location of filter unit).

I use metal lines on the fuel system, with one flex segment as original (usually near the fuel tank).

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.