Could use some help identifying some roller rockers

I swear I did some research on this before asking. Well, on the rockers anyways. The rocker studs were a revelation to me so I didn't look into them before asking here.

I am pretty well convinced the rockers are just generic SBC rockers. Found plenty that look similar from places like Jegs, but they had different markings. Either way, I think they are just a standard roller rocker.

The rocker studs appear to be a match for the Crane conversion kit:



Crane Cams 36655-16 Crane Rocker Arm Guideplate Conversion Kits | Summit Racing

The valve appears to not have dropped and instead is missing a lash cap or something similar. There are 4 missing on that head, no idea why. Just one more thing to add to the list of parts.