I don't quite understand what you're saying here, but I don't believe that there were any 383 Superbirds, so that's kind of odd.
As to your original question, I also wonder, (like quite a few posters here), why you have concern that your valve train is not oiling properly. Most of the advice given here is good, FReeper motorheads are purdy smart. I'll add my two cents FWIW...
You probably won't be able to see much through the various holes in the valve covers, but you should at least be able to see if you have stamped steel rocker arms or cast units, (possibly even something more exotic). If the rockers are the stock stamped units, they are non-adjustable for valve lash and that means you have hydraulic lifters. If this is the case and they were not getting oil, it would indeed be noisy. If not noisy, that would only mean that the lifter galleys are pressurized and is not a guarantee as to whether the heads are oiling properly.
BTW, it's possible to have adjustable rockers and still have a hydraulic cam, but that's somewhat unusual.
I had one thought that hasn't been mentioned yet. It would require pulling the valve covers off but you wouldn't have to run the engine. Get an oil pump priming tool, (you can buy 'em, I built mine, nothing to it, hex stock, I forget the size), and a reversible drill, (counter-clockwise is the direction). Pull the distributor, making note of the rotor position. Pull the cam gear, again making note of the position. Insert tool, spin it and pump oil as long as you want, probably want to do this when/where it's warm. Take pains to not bugger up the distributor bushing in the block, although it may need one anyway if the rebuilder didn't replace it, (it's easy).
I took great interest in this thread as I am currently giving my older brother's '70 Roadrunner a pro street treatment. He bought this car new when he was 16, a 383, 4-speed car. Put a 528 Hemi aluminum head motor in it, talked him into putting an 8-stack Hilborn setup on it. Tube front end, tubbed with a 4-link, the works. Grew up with that car, love that car! Might even get it done someday.
Hope this helps, good luck! We'll need to trade some pictures.
...ping to uglybiker, anotha FReepa Roadrunna lova...
When I first got the car (alleged) rebuilt 383,, the oil was CLEAN. After got it running (2 min) the oil was milk.Changed the 0il & filter. Ran again,, 3 min @ a time for maybe 15 min. No oil comes up to the valve covers. So Dropped the oil pan,Cleaned the screen(dont ask It was gray sludge((which I think is part of the problem)))Pan is back on (screen is clean) Starts Runs No oil in the valve cover. Yeah get an oil pressure gauge. Then what??