Where were we? I think the borrowed throttle bodies were on, driveshafts fitted, ready to give the engine a run and try some gentle movement under the car's own steam. So we (meaning Barry and I) gave it a run. Resulting in good news and bad news.

Good: Starts easily, no funny noises, revs cleanly and responsively, good oil pressure, feels fine. When we dumped the oil after a few minutes running everything was nice and clean with no nasties to be found. So the basics seem good - phew! - but doubtless lots of tweaking will be required in due course.

Bad: Well, the day ended with more of this sort of nonsense:

....and the engine back out of the car: