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I would not recommend any sealant at all (no need- the BMW gaskets are very good). Be sure to reference the the torque values for the pan bolts and don't over tighten.
Only the bolt directly under the oil filter is tapped through on the later Airheads. The rest (and the gasket) can be installed dry.
What do you consider "later"? The OP has a '78.
Since the bolts thread into the open engine cavity, oil can migrate down the bolts. It's best to include some kind of non-hardening sealant on the bolts, basically the same stuff you'd use on the cylinder base surface. Something like Hylomar, Permatex Ultra Gray, Yamabond, Dreibond, etc.
If using longer bolts, make sure that they do not bottom out before spec'ed torque is reached. If the threads have been damaged from prior over-torque, then other measures are necessary. I loosen and re-torque each bolt before I remove the pan to confirm that they are all good. You would not want to find that out during re-assembly.