One advantage to using rigid tubing is that it won't be compromised by exhaust heat. Both those lines run pretty close to the exhaust pipe, and just a minor mistake in routing them can result in a heat-damaged line that can empty the engine of oil in just a couple of minutes. Some installations I've seen use 1/8" pipe nipples 6" long into the block ports to avoid getting the flex lines too close to the exhaust.
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!