Congratulations on finding your boat. Someone used to advertise engine mounts in Afloat magazine, but not now, I found Isoflex and Polyflex on a search, see what you find.
Are you DIY for this job or researching? Using a mechanic to realign the engine would be a good, depending on your expertise.
Sounds like the water pump needs attention too. There is a problem with the drive often touched on in old threads. There is a Johnson replacement I think, best talk to American Diesel (another search), they respond well to questions and happily send parts to Australia.
Island Gypsy 36 Europa "Doriana"