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Update: SOLVED! I was about to give up and return the Delco coil pack and ICM, but for fun I put the old Magnavox pack on and it wouldn’t work either! I did I did a little googling and came across this old post: https://forums.aaca.org/topic/332605-1990-reatta-occasionally-wont-start/ His problem was that the coil pack wasn’t grounded. I already thought of this, or so I thought. I double-checked and tightened the bolt where the ground wire goes from the engine to the frame. I had loosened it to get to the screws for the coil pack and I thought I had tightened it enough, but I hadn’t. Once I tightened the bolts for both the ground wire and the coil packs, both coil packs worked! It just wasn’t grounded “enough.” Of course I removed the Magnavox one and installed the Delco as has been recommended to me by many people. So the good news is that yes, a coil pack from a 3300 engine (in this case a Buick Century 1993) is the same part and will work. hopefully that opens up some junkyard options for people. Thanks for the helpful comments.

I saw a post by Marck on his Facebook page indicating he was working with another shock/strut manufacturer (not Monroe this time) to produce another batch of rear struts. I too have started to stockpile components and have two sets of rear struts, a set of front struts, caliper rebuild kits, ignition parts, etc. Though, putting on less that 1000 miles a year I may never need them, but there is a lot of emotional history with my car as it belonged to my father and I plan on giving it to one of his grandchildren some day.

back in the day when we were doing compass mirrors in our Reattas I also grabbed a couple from Olds Intrigue. They used a different harness from the Reatta but as luck would have it the harness is the same as the Regal making it plug and play. So now this directionally challenged driver has some idea where I'm going!

I am sure the coils would work but I am not so sure about the ICM. The 3300 Buick does not have a cam sensor and uses batch fire injection. I do not know if they simply ignore the missing sensor and the ICM is the same, or if they are somewhat different and the pinout may be different. I would look online and compare ICM part numbers to see if they are the same.

Never tried a 3300 in a 3800 as there are so many 3800's out there, why take the chance. Try taking it back and exchanging it. The yard should have marked it so they know it's theirs.