The old Datsuns are terrible for fuel leaks at outlined above. Common leak point also is between the inner and outer shell of the injectors themselves. (metal to plastic). But it seems you have isolated the problem to the hoses and clamps. You clearly have 5/16" hose you are using. While it is roughly equivalent to 8 mm, possibly this Datsun is extra annoying and needs the more correct 8MM hose it came with. Just a thought. The factory looking clamps, non-serrated are the best clamp type you can use. It looks like the worm screw clamps are cutting into the outer jacket and bulging the hoses some where you are using them. Great cars other than rust and fuel leaks. Those are definitely the trouble spots.
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