I bought 3 700's in 93, toured on 1 till oil pump trashed. Still riding that one with one of other motors. Got an oldest bike award from WI. Doing original motor now, it had been blowed up before I bought it and fixed. It had 2 different rods in it and you can see damage in the block from a broken one spinning. No one wanted them at the time I was buying them, they all wanted 750 Ambo's & 850 Eldo's. 67, 8 & 9 is what I have. I ride the 67, wouldn't think twice about going anywhere on it.
Guzzi made them to tour, if you don't trust your bike get a different mechanic.