It's largly normal...perfect would be to the right/right-forward. Usually the quickest thing to go on Carbines are the extractor, so you may want to swap that out on general principals...wearing a hat might be good, too, because it's not uncommon for some cases to come back and bonk you on the head.
You shouldn't have to worry about pitting; all M1 Carbine ammo was non-corrosive. You might want to check the muzzle crown, but other than that and the extractor...that'd be about all I'd have to check.
Well, and the gas piston area. Check to see if the screw that holds it down is staked to the oprod assembly. If it's not, get a gas piston removal tool, and take the sucker out; guaranteed it's got 50+ years of gunk behind it (and it still works! reliably!)...just better safe than sorry
If it's staked on, no big deal. Hit the area for a couple of minutes with an aerosol brake cleaner or carb cleaner to flush it out a bit and you should be ok.
I have one Quality Parts carbine (blue sky import) that I put a repro M1A1 stock on; took a fair bit of fitting but it's pretty nice now. I have another Quality Parts carbine (non-import) that is probably my favorite plinker right now. I also have an Inland one...low serial number (17XXXX), in almost perfect condition; proper flip rear sight, proper bolt type, proper stock type with cartouches and what not...problem was that it had been re-parked sometime during or after the war, and not packed in cosmo (so it's black). Also..the rear-right side of the receiver was externally pitted pretty badly. Only things that could cause pitting like that would be salt water, or blood. Still a great plinker though.