Check out parts prices on Evil Bay since this seems to be about the only place to find then on a steady basis.

Some of the parts are quite pricy. Such as the thermotime switch or the trigger points. I think the trigger points can be reworked but the thermotime switch is not an easy thing to repair if can even be done.

The MAP sensor is also an expensive item. Check to see if it is holding vacuum.

And the heater and A/C need to be in working order. Check that the heater is not bypassed as pulling that heater case out is a massive job.