Got everything connected but have left all of the engine and gearbox mounts loose at the moment. The last couple of times I fitted engines and gearboxes I could never seem to get the gearbox mounts sitting square and they always looked under stress. So I thought I would let the engine run like this to see if the engine & box would settle into a comfortable position then tighten it all up.
Got the engine fired up and let it just tick over, had what I thought was the usual oil ,etc burning off the exhaust then I realised that the smoke was getting worse then noticed that oil was getting sprayed all around the rear of the engine bay, in my face and even up onto the rear window.

I had fitted a new o-ring from a new gasket set in the centrifugal oil filter and it seemed a bit small to me but it went in OK and I added some sealant for good measure just in case. Well that obviously had not worked. Fortunately working from underneath I managed to remove the 6 bolts , bust open another gasket set and fit what is now the proper seal. All seems well now even if a little messy. So got some tightening to do then a road test later on I hope. One thing I discovered also is that there are 2 different engine mounts for the A/C 126s. I think that it is the earlier engines that have a fixed threaded hole in the plate that bolts onto the engine so no adjustment but the later ones have ahave a sliding nut arrangement to give a bit of forward/ backward movement.