I would like to offer up two comments/suggestions: (1) remove the wire ties holding the spark plug wires together and get spacers. Local shop had problems with a customer's car until they figured out that their young and inexperienced mechanic had wire tied the wires together....and second comment, at this point, would be to find a local engine builder close to you with GN experience who can look at the motor for you. Sounds like it will save you alot of time and aggravation, and probably even save you money in the long run. I know you would prefer to deal with the guy who built the motor, but I think he has shown that he isn't willing/capable to satisfy you. Good luck!