Jason posted a few days ago that he has about a 1000 Sun Tune-up sheets for sale
https://www.yenko.net/ubbthreads/ubbt...Number/676530/
Those sheets list the coils (plus a lot of other information that some might call trivial) that were factory installed and on which specific car and engine. I'll bet if you asked him nicely, he'd pull the sheet for your car and sell it to you. Believe me, paper documentation is worth a lot when you are wanting to narrow down ancient history.