Do you have any junkyards near you to get trigger wheels?

If not, Car-part.com showed a handful of whole distributors for $19-25, which is the going rate at the PickaPart near me.

You probably know, but make sure to get a TBI dizzy, NOT a Maggie (Mag has a 1-tooth wheel). TBI is a little uncommon, only from around 88-91 on 318 and 89-92 on 360 -- and only in trucks, too.