Wow, this thread has taught me a lot, and there is much more to this than i am likely to learn.
One thing that confuses me is that my engine mounts look fine, the rubber isn't sticky, I can still fit my finger beneath the metal cup over the rubber, yet the engine is lower than it was, (or the prop shaft is higher) but cannot be adjusted higher as the bolts are at the top of the thread.
So, i am looking at putting steel shims in to raise it so that
a) it can be aligned correctly and
2) the bolts can be further down the threaded rod.
But, how did it drop? it's mounted on steel.