Yeah, wasn't planning on using the grooved one. Dad used to go on junkyard crawls & pull the rocker assemblies off any 273's he came across, so not surprised they're trashed.
But any new ones will need to have 273 style oiler holes for a mechanical cam, correct?
Yes, the grooved ones are for iron adjustable rockers. It all depends on what new ones you buy whether they are drilled for adjustable rockers. Shop wisely.