There used to be a web site called www.jtr.com
I just tried to see if they were still alive but was hijacked to some site in Korea. The JTR means Jags That Run which refers to any Jag that has had anything with the Lucas logo lifted in favor of Ford or Chevy components to support the newly installed 5.0L engine. Maybe someone else knows how to get in touch. They are experienced in V-8 swaps including instructions and specs of custom parts required.