440 wont start
Popping and banging?
Try a different coil.
Any chance you whacked the ballast resistor on the firewall
when pulling the driver's side head off? Try another one anyway
(after the coil first).
Both of these 2 minute-to-change items could cause the symptom
you describe.
If one of these works, I hope you don't get a welt in the middle of
your forehead from smacking yourself!
Good luck.