Michael,
There’s a guy I can recommend up my neck of the woods, Norfolk that is, but the one thing that added a lot of time and money to the cost of rebuilding mine was getting the barrels off the cases. If you’re extremely lucky that won’t be an issue with yours, but if you’re like the other 99% they won’t budge for time nor money.
Is your engine apart or just showing a big hole in the cases? I couldn’t see a pic attached on your first post about it
Andy