Machine the face of the cover and new rotors and you should be good. Check face clearance of the pump rotors to housing. Should be a couple thou.
If you can find someone to anodize it after machining that would help durability.

Put a dial indicator on the shaft at the distributor end, zero it. Then install the pump. If the shaft moves up you have an issue.

Looks like the inner rotor is digging in to the cover. Might be just due to the debris.