Start looking through all of your ignition components. You have a [lot] of ignition add-ons.
I don't get a warm fuzzy about after-market distributors. I forget if you're running one.
Look at the MSD stuff and start bypass those components one at a time.
Also: Did you check your base timing? --And-- Don't forget the chip and ECU connectors.
It's weird that worked and then just didn't. So... Something took a dump. Your fuel system is still suspect too.
I don't get a warm fuzzy about after-market distributors. I forget if you're running one.
Look at the MSD stuff and start bypass those components one at a time.
Also: Did you check your base timing? --And-- Don't forget the chip and ECU connectors.
It's weird that worked and then just didn't. So... Something took a dump. Your fuel system is still suspect too.