I totally favor 100% AMC, but there are plenty of times I think its OK to hack up a car. For every survivor, specialty car, zero-miles, SC/Rambler, there's a thousand ordinary putt-putts awaiting attention.
Like the car Frank featured in AIM, it's good PR for non-AMC people to consider AMCs an acceptable platform for projects. They won't be hacking up rare models simply because they'll cost too much.
Another Rambler on the road is a Good Thing, regardless of engine under the hood.
There's plenty of people who do quality work on non-AMC cars, and some portion of the non-AMC car nuts will discover that the AMC '8 is a great motor. There's certainly butchered all-AMC cars too, it all depends on the quality of the result.
If Rambler Americans (for example) become a popular platform with 350 Chevy's in 'em then fine, especially if it led to repro chassis and rubber parts! Weirder things have happened -- Willys coupes etc popular all out of proportion to the interest in the car as a whole.
If I wasn't the idiot that I am, it would have been FAR MORE SENSIBLE to stick a non-AMC drivetrain in my project 70 Hornet. I have a very particular look I want to acheive with this car. It's not worth any money, it's nothing special. It came as a (barely) rolling chassis with junk stuffed into it. It's been 6 months chasing down engines, transmission, driveshaft, shifter, etc and I'm still not done. I'm building it to DRIVE not sell.
You east-coast people have NO IDEA how hard it is to get hard parts this far west. You'd never put up with it.
A car is more than an engine (to me, anyways) and no one but fanatics would put up with this crap. A 250 6-cyl chevy with automatic would be CAKE and half the cost. It's simple economic reality. If I knew I was going to have this much trouble I would have done that. I far, far prefer the 232/258 but sheesh it's been a lot of work and searching.