Freelander 1 Hubble Bubble Boil n Trouble Headgasket

Hi folks,
previously we (my son actually) had a non starting F1, so thanks to the help here we replaced the dizzy and rotor and got her running.
However previously he had an overheating escapade when the hose from the expansion tank came off and he ran her dry, but she was running.
Now its got very lumpy so he came up to the farm this morning and it's cleary only running on 3 and behaves like a movie set smoke machine at idle.
So we looked at the plugs and surprise surprise on Nr2 (from the left) when I pulled the plug lead it was and i do not joke bubbling water from around the spark plug. Im a SeriesIII owner and have had a Disco2 (nightmare had to get rid of it) but in all my years I have never seen that!

So its clear we are going to have to do a head gasket change but first we will throw in a bottle of radweld head fix to get him to and from work this week.
The HC job seems fairly straight forward and as I'm aware it's an interfere head that the position of the cam shafts is critical of course but what I'm more interested in is the head bolts.

I know its best to get new ones but i also know from my African/desert experiences that the bush mechaics readily re use them and I have read that there is a way of checking them.
Does any anyone have an experience with this?
Any helpful tips or is there a previous thread on this ( i couldn't find it)

thanks folks

Happy weekend
greetings from the Alps

Simon

First off DON'T USE ANY KIND OF RADWELD!! It will block the tiny coolant passages giving more trouble down the line.
Second, the K series engine will not tolerate low coolant without damage. There's no mass in the combustion chamber to absorb heat, so lots of damage is done in seconds.
If it's overheated in any way then it's very likely the cylinder head will have gone soft (they are heat treated), and is now scrap.
Not replacing the head will simply result in repeat HG failure in a few hundred miles or less.

Cam timing is easy, but moot unless the head is checked for hardness and replaced if found to be soft.