Well it's been a long time since I updated this but thought I'd add a few more details for those that have nothing better to do in their lives than read my drivel! :lol:
I have been wanting to restore the A/C for quite a while on this but until recently hadn't seen a good way forward as the engine was only ever manufactured using the old fashioned V belts as well as having the alternator on the passenger side. So I decided to bite the bullet and attempt to convert it to serpentine belt which also required swapping the alternator and compressor to alternate sides of the engine, mainly so I could use the original plumbing and wiring for the A/C.
The switch was a bigger job than I expected as being a diesel it also has the brake servo vacuum pump on the back of the alternator which is oil fed from the engine sump. So I had to re-route a few cables and pipes as well as sorting out fixings for the compressor and alternator. Anyway, I got it done but on starting the engine the tensioner was vibrating in a destructive sort of way. I couldn't leave it like that as it would destroy itself in no time. So I've added an adjustable stabiliser bar.

So the set up is now using a machined down gold top (30NE) crank pulley and drivers side ancillary bracket. A C30SE water pump, V6 Omega PAS pump and compressor. I've also used the A/C plumbing from a 2.2L Omega so just needs a re-gas and testing!
Unfortunately it's recently started spitting water out of the header tank which I thought was caused by a crack round the filler hole. After replacing the tank and cap it's still doing it so I suspect a crack in the head. I've managed to source a replacement head from a nice chap in Kent so when the weather improves I might have a crack at it. It only causes a problem when cruising at above legal speeds and has never actually over heated so is liveable for now.
I've also fitted a 3.45:1 diff from a diesel Omega so it revs nice and low now. It's done about 9000 miles since being built and is now my daily driver, and I really like it!