Originally Posted by $hawn

ball up a paper towel and put one in each port, there isn't a fool proof way.
depending on how old the gasket is, you'll have to grind, scrape for sure.
... and most heads like that have 170-180cc intake, 240 or so cfm.


*edit

FYI
don't use the end gaskets that you get in the set (rubber or cork) throw them away and yes a nice bead of Prematex