A tad behind with updates on this sorry. Its taken a little while to work out what to do engine-wise. In the meantime, I tidied up the broken one, since it would go back together when a head turned up.
I cleaned up the block ready to put the lower sump back on
For those who may be curious, this is where the crank locking pin goes.
Lower sump back on
Metal oil cooler pipe
I flushed the oil cooler with brake cleaner until no more slime came out, then put it back on
Cleaned up the mounting face on the block ready for when a head turns up
I'd removed the oil retention valves while the engine was upside down to let the slime drain out. Cleaned them up and put them back in.
The breather plate is a; really expensive and b; back-ordered so I cleaned it and re-sealed it using the same silicone as used on the sump.
Ready for a replacement head.
