Either line can have the restrictor- - - -the downstream location works best. That duplicates the flow the original canister filter has, which is MUCH better than a spin-on, BTW. Why not just mount the canister on the inner fender or the firewall, and use longer flex lines?
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!