Managed to get the bellhousing off the other day. The clutch came out easily enough. However the fly wheel was another story. After trying a wrench and successfully smashing my thumb, I stopped for the day
The next day I decided to fire up the compressor and use my air gun. I should have used it first as all the bolts were out in less time then it took to smash my thumb. Lesson learned. The bellhousing then came off easily enough.
I then decided to use some oven cleaner to start degreasing the engine. I've read online it's good for also removing the old paint. It not so much with the brand I bought. Post Christmas I'll come up with something else to use.
My next big task will be removing the bell housing from the other engine and getting it cleaned up.