No3 and No 4 aren't really acceptable leaks either.
I have blown up a number of engines inmuch the same way, beleive me no matter what they tell you , any mech . that is even your best mate, it will nearly always be something different when they take the head off.
your best bet is to pull it down and find out before you make any descisions.
If there is the chance that you may build it , take it to the place you will get to o it and tell them to pull it down untill they find the problem .