I've used the older 327 style intakes on later 350 engines. I generally remove the oil filler tube and block it off with a Dorman expandable rubber plug.
These are stock car motors I do this on and want to limit where oil can come out of. I run 2 breathers/oil fills on the driver's side valve cover.
I just think that with the later valve covers, the old oil filler is not so good looking.
Bob