Unless you're doing a 100% original restoration, the flex line isn't necessary. There's no relative motion between the filter housing and the oil gallery, so you could just plumb the system with hard lines for both pressure and return.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!