I agree that the 45* elbow fitting is original, but the steel double-male adapter fitting screwed into it is not; if you'lll look in the Assembly Manual, section U17, Sheet A3, View "D", you'll see the nut (item 14) and the sleeve (item 13) - those are the two parts shown in the front of the photo I posted.
I've never owned a BB Camaro, but I think the original oil line was nylon (as were all the small-blocks) due to the complex routing to the gauge in the console.