Some engines just aren’t worth it. There’s a reason everyone does an LS swap it’s trusted. Even if you do a total rebuild at great expense, some used engines have inherent weaknesses or parts are hard to come by.
Being one of the most iconic Buick nameplates still around, it’s not surprising that the Tri-Shield badge’s sales revolved heavily around the good old Regal. However, the aging Regal sedan couldn’t keep up with the more advanced competition and its sales took a nosedive in 2017.
Some enthusiast may point out the Road Runner-based Superbird, as a better car but we are not among them. The styling was too radical and the Hemi powered Road Runner was just a better overall car.
Find one of these in any old breadvan in the RV section of Craigslist no lowballs, I know what I have. The Cones-in-a-Parking-Lot Society scoffs at you for doing anything to a stock Miata outside of firming it up, so putting used engines in Miatas means provoking an internet army. It’s rare to hear about a swap that improves something about the stock balance of performance and durability, because most of them throw it out the window.