273 adjustable rockers on 360, very little oil to springs

The shafts can go on either side. Keep the notch down and to the left and each one works the same.

Be aware that the diesel oils are gradually undergoing the similar reductions in ZDDP. I have not kept up with that recently, but it is not as high in ZDDP as it has been in past specs. CJ-4 diesel oil specs limit phosphorous to 1200ppm, which means ZDDP is probably at 1300 ppm, which seems to be an adequate level for flat tappet use. But not all such CJ-4 oils actually have that level of phosphorous; I read one report of a CJ-4 at 1000 PPM of phosphorous which means ZDDP is at 1100 PPM, and that may be marginal, depending on the spring pressures.

And this is a useful read on ZDDP levels and current oils:
ZDDP Q&A - National Oil & Lube News