how much work is involved in putting a z6 head on a y8 block?

i've already completed the first stage of my d16 build which is building the bottom end, but i want to move forward and build a head. i am told that a z6 head will outflow a y8 head and in turn make more power than a y8 head

 

the Z6 head does flow better. i believe the only thing needed for the head to bolt right on is the head studs.

 

Yea, use nine y7/y8 head studs and one z6 stud.