if you were to run a 20v in rwd with rwd water pump and setup pretty much as a 16v 4age would you use a 16v head gasket or a 20v head gasket???

i had a look at the head gasket for a 20v and other than a bypass i have at the back of the head and the top hose outlet there isn't much in the way of alot o flow thru the head.

just curious on peoples opinion in the matter