@Paolo that tool won't work in your case. It's designed to push down on the end of the stud ...which you don't have as your head is retained by 10 bolts...
the tool is needed in cases where the steel stud and the aluminium head have stuck together due to galvanic corrosion, that's not the case with your engine, as the head retaining
BOLTS came straight out. The head stuck on
STUDS is not your problem
The head (and gasket) locating dowels are hollow metal tubes that fit around the spot on the front corners where the bolt passes thru, they only fit into the head and block by about 8mm each side.
SteveC