The R286/500-4 was commonly used in the Super Stock Hemis in the late 70's and maybe early 80's. The R290/446-4 was the first popular Crane grind for the Pro Stock-style Hemis, but was a killer on valve springs. It was replaced by the R296/4778-8 which wasn't quite so hard on springs even with more lift. I have never heard of the R285/410-8 but suspect it was for the heavier Super Stock cars.

Mark