I have to think there is someone around Hastings that is familiar with older vehicles (even the front facing spark plugs aren't horrible compared to how plugs need to come out of some cars and trucks). there are some facebook Fiero sites that are monitored closer, that if you asked this question I'm sure there are some owners in that area that could point you in a direction.
You are aware of Minnesota Fiero's Forever? awesome fiero group with great people.
[This message has been edited by Grantman (edited 05-16-2018).]