We recently purchased a 1967 Volvo 122S for my son. We've gone thru the car, drained the gas tank, cleaned the carbs, changed plugs, cap, wires, etc. But, we are not getting any spark. The only thing left to change is the coil. This is the coil that is wired directly into the ignition switch. Does anyone out there have experience changing the coil, and what are the steps? Thanks, Steve