Welcome to the forum, Leonard. I'm afraid I am of no help with the Esprit engine either. Hopefully another member can be of assistance.
This is the best forum around for the Europa, but it would be worth checking an Esprit specific forum (assuming there is one). It may also be worth your while checking the Lotus Talk Forum
https://www.lotustalk.com/ , which has a wide knowledge base and resources for all Lotus cars.
We would love to see some photos of your Lotus cars, if you can post some up. Cheers