The thing about a good shop is not so much WHO works on it, it's their ability to bounce ideas off the 'boss' or the other wrenches. When I worked at Ford and Chrysler dealerships as a 'wrench' I was no different than when I worked for 'Joes Garage'. What WAS different was that I had access to:
1. Books and reference materials largel unavailable to 'Joe'.
2. Other wrenches with experience on the specific cars in question.
Hopefully whoever worked on has good communication skills with the other guys around him. Is it fuel or spark? Sounds like that still has to be determined for sure...
Cobras are NOT 'high tech' machines, what you need is someone like you got, someone that understands 'old school' not just how to read the diagnostics computer that plugs in to a modern car.