Engine Swap Compatibility

67Dart273 hit the nail on the head about having enough time, money, skill, determination, tools, a welder/ torch/ and plama cutter, you can put "anything" into "anything." IMO if you're not a welder/fabricator type, having to pay someone to make the mounts can gobble up the savings of the "free" AMC motors.

The AMC motors make good power and torque when leaned on. If, however, you want to turn left and right as well as go straight, they have a problem. They run into a situation where they starve for oil because it is all in the upper end. Penske went through a bunch of engines in the 1970 TransAm season figuring out that the upper end needs an oil scavenge system.

IMO build a Mopar engine for your car. Not for the sake of originality, but for something that is reliable and straight forward. After all, Mopar put every engine it mass-produced in the time frame in the A-body. It's just a matter of finding the parts or substitutions to do the job.