In my opinion the discussions regarding the head gasket issue are misleading. Do your homework on it yourself to be sure, but I think the collective estimates of the forum members over there put the number of head gasket failures at about 10% of vehicles. If it does fail, it seems to occur in the range north of 150k miles. If you fix it, you're good for at least that many more.
As for the birfs - they do wear and will need rotation (you can swap sides left to right once) or new ones at some point. However, so long as you're not attempting to power up an obstacle at full steering lock with a heavy right foot you'll not likely break one. You can do a birf job in your driveway in a weekend.
This is only my opinion, of course, and there are many on this board who have more miles and time with their 80s than I who will hopefully chime in with their opinions. 'Mud is definitely required reading when you buy an 80, but if you spend too much time there you're going to develop vehicular hypochondria at some point.