As I said previously, the original engine was gone... probably when the car was raced.
I tried to find a complete S unit here in Portugal, but gave up quickly. Thought of having one shipped from UK, but it was too complicated (the seller didn't help) and after a short period I gave up as well. So, started to buy bits individually. 4 years later and a lot of money spent, here's the result...
The block was at +60, with one cylinder heavily corroded and so it was sleeved back to STD.
The extra hole for the modern oil pumps was drilled and tapped.
The gearbox was refurbished with new bearings, shafts, etc... Also put a x-pin diff. 3.44 final drive.
Camshaft option went to SW5-07.
Crank is an AEG316, rods are AEG521.
The head is a 940/1805 casting with some work done.
All the electrics were refurbished with new brushes, bushes, bearings, etc.
And finally, paint time!
Assembling the rest of the bits:
And job done!
And here is a video of it running