I recently found out that the #14 head on my om603 3.0 has cracked (no surprise).

So, ive been trying to find, either a new 3.0 #16 or better head, but ive also found 1 or 2 3.5L heads kicking around on the interwebs.

Can i just use a 3.5 head instead of the 3.0? I hear they are better than the 3.0's.

And if i do pick up a 3.5l head, is it as easy as putting on the new head? or are there going to be different parts that i have to pick up?