Tell me a little about gearcase pressure and vacuum.

Sound like a lot of money you will be laying out here.

If you can, take them in and have the basic checks done on them, visual,
compression, spark, gearcase pressure and vacuum, test run, et al.... It
may
cost you a few bucks, but these checks could save you a lot of hassle and
cost down the road.

Secondly, don't trust what the other person is telling you. He might not
even know there might be problems with these engines, as I just found out
the other day dealing with another product that was for sale. Just my
visual
inspection told me this engine had many problems. The basic checks will
tell
all.