Super Match?? What to look for

I am going to look at a "Super Match" that a guy has for sale. He says that it is a heavy barrel with oversize stock. The serial number is 200**, sold 10/1981. I contacted Carol at Springfield Armory and she said that it left Springfield as a standard M1A. The rifle has a TRW bolt and NM sights but the guy says that he has never taken the receiver out of the stock because of the bedding and has no idea about the rest of the parts. He doesn't know if it has a rear lug or not.

If I am going to pay a premium price I will want to know if all the parts are GI. The guy says he has had it for many years and has never fired it, no idea how much use it got before he got it.

What else should I look for? Anything to look for specifically on the barrel?