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All you need is for the integrated bearing surface not to have raised edges that would set the cartridge out of alignment. Ideally also remove any existing rust without changing the surface too much.
Wire wool away the rust, don’t worry about the pits, use fine sand paper on that gouge on the left if it has raised edges. Test to see if a dry cartridge fits in properly, and if it does then reinstall with a healthy amount of grease.
Leshaches
I recently purchased a Boardman Pro alu/carbon frame c. 2008 from eBay. Unfortunately, the bottom integrated headset bearings were rusted into the frame. I got them out fairly easily with a cup removal tool and degreased but there's still a fair bit of rust in there. On closer inspection, I also noticed some corrosion around the lip of the headtube too - see photo.
I wondered if anyone had encoutered and/or fixed a similar issue? I was thinking I could remove the rust with some very fine wire wool but wasn't sure what, if anything, I could do about the pitted and worn area?
Thanks