2JZ VVT engine swap in an Early A Body?
If you think about it though, as long as the aftermarket stays around like it did for our pushrod V8s there will probably still be people building and swapping JZ and UZ engines 20, 30, mayyybe 40 years from now. The Japanese engines from the 1990s and early 2000s were the last (relatively) easy-to-swap and easy-to-build mills they made, most of the stuff made before then wasn't quite world-class in the HP department and everything after is just insanely complicated with all the tech and computer integration. I think if there is enough demand for keeping a 2JZ running 20 years from now people will make products to do it. I haven't torn down a "legacy" Japanese engine yet but I hear for how much they cost (especially compared to Euro stuff) the standards to which they are built is staggering, and the level of tech is still way up there but usually done in a more conservative and practical manner.
Look at the inside of a VW/Audi, BMW, M-B etc. engine and you'll wonder how it can even run for 100k miles just from all the crap going on.
EDIT: But at the end of the day there is something only American companies can make: TORQUE, specifically below 2500 RPM or so. Everything Euro or Japanese is gutless below that speed.