Coil pac was not hot. Have since replaced it with a new Delco, also replaced the ignition module (Delco), have 8.5mm wires, resistance is almost perfect. Is backfiring out the tailpipe. Fuel pressure stays up there, have Red Armstrong twins.
In searching for the problem, it appeared to be missing on one cyl., sometime, removed the plug, looks OK, gonna go back with a new set of NGK's.
Boost peaks at 17 lbs., usually run 28 lbs., which is no problem for my setup.
Help anybody?