The lifters look OK.
I think some cylinders do get run even that bad but I would not like it. If the pistons are good maybe second hand cylinders would work. Or a set?
You know that since you are already looking for a cam shaft and 308's seem more available then you could also do 750 or 900 cylinders if a suitable pair could be found.
It's really easy to do once you start spending bunches of money.