That external oil line conversion was pretty common on Ford V8s in the 1950s and early 60s. The cam bearings on those engines had a habit of turning in the block slightly and shutting off the normal oil flow to the cylinder heads.
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!