Here is the link to the vacuum valves of which you'll need two;
https://www.dennis-carpenter.com/car...embly-in-block
This the link for the vacuum thermostat control valve which is operated from a cable/lever from the control consol, this is the valve Barry mentioned;
https://www.parts123.com/parts123/yb...9a~Z5Z5Z5AAAHV
Here are the brass elbows, you'll need three.
https://www.parts123.com/parts123/yb...Z5Z5Z50000129A
Before all this though make sure you can get or make a set of tubes.
The 5/8" ID heater water hosing is easily found at any car parts store.
The 90 degree brass connector on the drivers side of the engine is screwed into a 3/8" NPT port in the side of the cylinder header head between the front and next exhaust header connections. Can only be fitted with the exhaust header removed if I recall correctly.
Similarly the straight steel fitting on the passenger side screws into a 3/8" NPT port in the side of the cylinder head between the rear and second from rear exhaust header connections. Again most easily fitted with the exhaust header removed.
Note originally the exhaust headers did not have gaskets at their connection to the cylinder heads but I think most owners fit gaskets these days.
I'll take some photos for the 90 degree brass fittings at the water pump suction side.