Just thought I'd chip in a comment about Transatlanic Diesels. I reconditioned my 4-108 last year and got my rebuild
kit and other parts from them. Sherri was fantastic! Really knows her stuff and efficient and friendly too. You'll find email
details on their web site.
BTW if you are looking to replace your heat exchanger
there is a good Bowman supplier in Aust that I dealt with.
Good luck with the rebuild.