New here, just bought '90 ZR-1

[A26B]

Looks like the broken cam chain has some rollers that are badly worn and at least a couple that are missing. With roller(s) missing the chain pitch no longer matches the sprocket pitch which probably precipitated the link breaking. You should have several pieces of broken rollers in the pan also.

Hard to say whether a sprocket on the drivers side chain went bad first or the chain did. Regardless of what failed first, all of the sprockets will also have to be replaced too, as you already know.

Oil pump has a few battle scars, but nothing bad. Good news is no damage to the block.

Will keep my fingers crossed for minimal damage when you get the head off. Not too bad so far!