The bottom of radiator should be brass so likely the boss was soldered on with a good fillet to strengthen joint If not sure how to do it … The high temperatures of brazing would melt the soldered fins into bottom, Remove rad and lay flat Clean up both parts with rotary wire brush in drill/...

Sounds like the oil feed to rocker shaft is same as 200tdi, via a machined flat on front cam bearing which pumps oil to rocker shaft, when i did my 200tdi in each rocker is 2 drillings that you can push standard size drill into ( can’t recall size) to ensure pathways clear. Not a gasket expert...

https://pablanchard.co.uk/Switch-for-Brake-Shuttle-Valve-AAU1700 Get genuine if you can

Not good, hope it’s not as bad as it sounds, as Kermit said perhaps one of the springs off the 3/4 synchro popped off,, if you take the top cover you should be able to see if all 3 still in place Did you take the box apart as part of the rebuild

Does the aftermarket gauge need matching to correct sender

Good range is it easy to work out which sections fit where 😳

Have you got any numbers and letters cast in on side of block, between the core plugs , this will give the date block cast

Good luck with the knee replacement , and hope the pain a lot better afterwards

https://www.landyzone.co.uk/search/5256887/?q=Cutting+out+when+hot&o=relevance

What’s it turn like with plugs out When rebuilding did you turn crank over as each main bearing bolt was nipped up

https://www.johnrichardssurplus.co.uk/land-rover-intermediate-gear-219468.html This is the part number from series 2 and 2a parts book and valid to suffix A What gearbox and suffix is in your landy https://www.sp-4x4.com/533080_p/533080.htm

https://www.landyzone.co.uk/land-rover/ricks-200tdi-tuning-guide.254178/ Not sure if pumps are the same

Think either of the above answers will be correct

Only one part number from 65 to 84 so should be fine https://www.johncraddockltd.co.uk/533080-genuine-intermediate-gear-1965-84.html

http://smithies.co.nz/land_rover/ Manuals and parts book here

Would then a replacement be a better option

Just pop round local stables and ask, then you can choose which one has best access and muck, they’re glad to get rid, we even have a tipper transit deliver fresh once a week but prefer the well rotted which was available within 5 mile

Correct horse poo! But we’ll rotted and not unpleasant 😀

There’s a few companies do this sort of thing https://www.jakewright.com/upgrades/land-rover-chassis-swaps