I'll assume you've checked for vacuum leaks and your coils good? I have had good timing lights not work on occasion on Brand New MSD wires and then later on ..work just fine ...so I've had that happen too. I use a matchbook to Gap the reluctor to the magnetic pickup. As long as you can just see between the two it's about .008,yes.
Have you pulled the covers off to see if all the valves are closed, stems are all about the same height? Valve lash?