Rightoh, got back and did a bit more.
Gave it a run down and up the hill, still getting roughly the same temp difference between front and back precomp covers.
One thing i did notice that didn’t seem to make sense as nothing has been changed on the fuel side was that there was no big puff of smoke upon start up. I also sat and looked closely at the exhaust, there is definitely a slight miss, it corresponds with a slight puff of white smoke seems to go away or at least i can't really notice it at higher revs.
At 1000rpm can't notice miss, cracking an injector line at these revs introduces a massive and even miss across all cylinders when individually tested.
It is also starting to slobber again out the exhaust.
Pre rebuilding the injectors, i was running it without the exhaust manifold so could easily see the slobber, mainly from the front exhaust port, this is a combination of #1 & #2 cylinders.
Now the exhaust manifold is back on, but i can see a bit of wet carbon looking leaking from where the manifold meets the exhaust proper.
Evaporust is black so is working, drained and got a bit more small sand size rust from system. Flushed very well, till system running clean, block coolant drain seems to drain better than before, I am in no way saying coolant galleries in block are rust free, but it's definitely better than it was.
I haven't pulled a core plug ( we call them welsh plugs), because I can't do know parts availability til tomorrow and want to keep it able to be run on case I need to do something.