About cams. I have found K7/K8 1977-78 cam for good price when K0-K6 cost much more.
The K7 cam has a molded ring beside tacho gear.
Last one with sprocket and end washer on from a low miler, $50US.
The first cam complete with sprocket, cam holders, rocker arms and shafts with most screws. Not much over $100US.
Also a low miler and not much wear.
But this was a few years ago.
Is this a later F cam?
The squares beside tacho gear look familiar.
https://www.ebay.com/itm/401926328658