No experience at all with the 207 engines- - - - -do they have a similar oil circuit to the 216 and early 235? Those engines run a 3/16" oil line through the water jacket, not a 1/8", and the oil distributor on the driver's side of the block restricts the flow to the head until there's at least 15 PSI at the main bearings. The oil line is soldered to the adapter fittings on both sides of the block to prevent coolant leaks into the crankcase. Use COPPER line only- - - - -a 3/16" steel brake line would rust out quickly.
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!