I'm surprised any Metropolitans are left. They had the same motors as the Austin-Healy bug eye Sprite. In the early 70's you could buy them for $25. Blow up your Sprite and it was the cheapest way to get a motor. I personally pulled at least a half dozen.
The coupe is giving me serious John Milner vibes.
The XJS looks like the one they did on Road Kill. The small block Chevy bolted right in. Trans and motor mounts. I knew a guy who put a small block Chevy in his 12 cylinder XKE. I never spoke to him again.