I'm currently running 3 orange case Sachs engines in my Texan (4.2), Sea Fury (4.2) and Corsair (5.2). I like the simplicity and reliability of the magneto sparked engines and have had fantastic performance from each of them for more than a few years now. Like Ralph says, just make sure you have sufficient oil in the gas and run them for all their worth. They will give you years of good service. My 4.2 Sachs in my Sea Fury is going on 13 years old and has never missed a lick.

Attached picture shows mounting in Jack Devine Bearcat.