Friends of mine with Cobras swear by them. Southern has the lock on FEs. Some time ago they got hold of a large shipment of them, some of the last ones made from what I heard. Bill is an up front kinda guy. They more than anyone I know of, knows FEs. Their reputation is heads and shoulders above most engine builders. They are always sponsoring Cobra activities, runs, get to gethers etc. If I had a problem with an FE, I would go with what ever they suggest. I doubt they would steer you wrong.
Bill