Hi, I did a search for "clutch" and searched through 3 pages of results to no avail so I'm posting. 

I have an 86 carberated wagon; the clutch is starting to slip, how do I change it?  Is it a difficult job - will I need to lift the engine or just remove drive shaft and drop trans?
Do I need the 8 7/8" 24 sline clutch?
Do I need to change the flywheel and other seals while I'm in there?
 

I've replaced a clutch or 2. Always done it by removing the engine. Seems like a good idea to replace the rear main seal while all that is apart. New pressure plate and throw out bearing. Turn flywheel if needed.

The 24 spline is the one you want. I'd have the flywheel resurfaced. Mabey change out the rear main seal while you're in there. Pull the engine to do the job.

I've done it several times pulling the engine or transmission. The transmission isn't too bad IF the car is lifted. But on a stock car, pulling the engine is way easier. Only downside is it requires an engine hoist....but I think it's certainly easier, at the very least, you're not doing everything laying under the car....

 

"Correctly" is to resurface the flywheel.....I almost never do unless it's in pretty rough shape.

 

 

IMO, if the rear main isn't leaking, don't bother. Due to it's size, it's fairly easy to screw up during install. Too much chance of causing a problem where there wasn't.