Your starting to scare me Julian,
You've got the entre dash and all the interior out ....... The entire front clip off, and your tearing into the engine. I hope you have a good organizational system to keep track of parts and a lot of space to store them. It may be years before some of that stuff goes back into the car.
Being a first time restro project you my want to slow up and focus on individual areas.
As for the engine ........ It needs to come out, be dissassembled and hot tanked or it wll never cool right. You can get your engine parts, (crank, heads, rods/pistons, etc), to the machine shop then too. I'm sure you did not want to hear that, but it will need to be done before that engine ever runs right again.
I hate to be the one to put a pin in your baloon Julian. I understand the enthusiasm. You must be carefull not to dig the hole to deep. Focus............!!!!!!!