Hi,
Sorry for the delay, I don't check here often enough.
I wouldn't recomend the swap.
The engine is a very tight fit but plenty of people have done it.
No swap parts are available but a simple a adaptor plate can be made to work and use an aftermarket (CRS?) flywheel.
If you email me your address I'll send you a write up I did on swapping into an early RR, as it may be of use to you.
Cheers,
Rod