Maybe i missed it but have you gotten an engine stand and flushed those head bolt holes? That’s going to be key. Same with bolt threads.
Don’t sweat it all. Designs like these cam towers are reasons I have closed my chapter or EA82s but hey its your special engine so i understand your commitment.
But to a lot of is older folks its just an EA82 and just do tour best, don’t go nuts with retotqueing the cam tower and etc etc but i am NOT a mechanic.
Good luck.