Why couldn’t they have just left jaguar alone? It was a fabulous (albeit frequently broken down) brand for decades. My husband and I had a ‘98 Van de Plas that was like riding on air. If they had allowed after market parts, it would have been affordable to keep. But when it ran, it was glorious!
If I remember correctly, Chevy 350’s were a good transplant into Jaguars.
My folks had a V-12 that was awesome - when it ran.