So I pulled the engine from my dormobile project to use in the riviera. I fitted a new flywheel oil seal and clutch (to suit the later gearbox in the 72), together with an alternator conversion and good secondhand heat exchangers and hardly used van exhaust from my "will come in handy one day" box.
The chap who started the resto on the dormobile a few years ago must have fitted a recon engine; the oil was clean, the clutch was unused and the ports and guides on the head were like new! Hopefully the rest of the engine is as good. There is certainly no endfloat and everything turns smoothly, it just looks a bit grubby on the outside.
The plan is to plonk this motor in and rebuild the spare with the 1835 bits and twin 40's over the winter; if I get six months out of this engine I'll be happy. I'll be fitting this one tomorrow, so stand by for a few pics.