[sunman]

Replace the Hall effect trigger in the distributor.
That is your problem most of the time, I have a new spare one in the glovebox.
The MSD light blinks 5 times if it’s ok when turned on.
Pull the coil wire and check for spark by tapping/grounding the MSD white wire ( point type trigger input).
If you have points get a time machine and meet us here in the future. The Party Bus uses this same trigger, has a new one in the glovebox too.