Thanks Neil, I'm sure it's going to have to be rebuilt, just a matter of when. The engine/box/loom is out of the donor today, I followed the engine out the top route. Never again. I've done it twice by removing the body from the subframe, supporting it VERY carefully, then removing the engine/box from the subframe and put the subframe back. Pretty straight forward.
This time the exhaust was a nightmare.. It's wasn't the usual system, tubular manifolds and three downpipes off each manifold, almost impossible to get at the nuts, took all day but it's out.

Anyone need any 164 bits?

Guy