Let's try to keep this limited to automotive engines and automobiles. Also, I'd rather exclude the LS/Vortec engine because they get put in anything and everything.
Probably the strangest one I've seen was a Cadillac 500 cu in V8 swapped into a 1987 Dodge D150 pickup. This was about ten years ago and the truck belonged to one of my customers at the time.
The challenge with Fieros, though, is coming up with something no one has seen before. Northstars, Chevy small blocks, LT1, LS1, 3800SC, GM Ecotec, 4.3 diesel, VW VR6, Mitsubishi, Chrysler V6, all-electric swap, etc, etc.... All these and more I've forgotten have all been done many times.Cadillac Northstar engine in a Pontiac Fiero, LS1 in a Mazda RX7, or the B16 VTEC in a vintage Mini Cooper.
Putting a Mopar engine in a GM doesn’t seem to rile anyone up that much. Now when someone puts a GM engine in a Mopar, all hell breaks loose! THAT’S BLASPHEMY! (I happen to agree with that, but I’m biased.)
Did they put truck suspension in?1967 Triumph TR4-A with a 389 Pontiac
I've seen a couple of 65-69 corvairs on YouTube that the entire driveline out of a 455 olds toronado shoved under the back end. No room for an air cleaner but it was a running and driving car.Back in the '60's
327 Chevy in the back seat of a Corvair.
Big Buick V8 engine in a Henry J,the motor was so big that the distributor sat between the front seat and the passenger seat,it was fast and loud.