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Even though you are trying to keep it stock, doesn't mean you can't make some upgrades inside the engine to make it run better. 516 and 906 heads are identical on the outside, and you can keep the 516's on the shelf.
It is my understanding that RL cast into the block stands for raised large. My 361 has LS cast into it for low small, and 383's I have seen have LL for low large. The 361 is 4.125 bore and the 383 is 4.25 bore. I thought a passenger 413 which was 4.185 bore would be an RS and a 426 which was...
My 1966 361 does not have any engine size cast into the block either. Just the stamping on the engine pad. Are you saying that the 361 and 383 blocks are the same casting?
My 66 361 has two of the top ones. They mount on the first exhaust stud on each side. The very bottom picture is the heat shield that mounts to the drivers side manifold
I helped a buddy with his 79 Corvette upgrade the engine. We used a fairly conservative cam and some modern iron heads. That thing pulled like it had an honest 350 horsepower, but he was still disapointed because with the stock convertor, it wouldn't spin the tires.
I considered something similar to the factory magnum cam myself when trying to figure out cam selection, but remembered that they hcame with higher stall convertors and better exhaust than the earlier stuff. I think a convertor will probably solve your problem.