DinoBru Here are the pics of my B20B head.
This is the area near the thermostat housing. Note there isn't any hole for a sender, but there appears to be a flat which could carefully be drilled.
![Image description](https://cdn.ozvolvo.org/assets/files/2024-02-09/1707445722-375424-20240209-130724.jpg)
This is the RH side of the head, where there's a cover plate fitted to B20A and B20B engines (carb).
![Image description](https://cdn.ozvolvo.org/assets/files/2024-02-09/1707445806-852516-20240209-131724.jpg)
This is the casting number.
![Image description](https://cdn.ozvolvo.org/assets/files/2024-02-09/1707445886-712492-20240209-130756.jpg)
This is the front of the head, where there's a pair of welsh plugs. The bolt on the LH of pic is for an accessory bracket.
![Image description](https://cdn.ozvolvo.org/assets/files/2024-02-09/1707445953-81896-20240209-130709.jpg)