Just check where your pistons are in reality and then take it from there, i would still stay away from the openchamber heads its stupid to buy something that has no squish and will require a whole lot of milling to get that squish.
Measure where your pistons are and aslong as they are not to far out of the deck get a set of closed chamber heads and adjust the squish with the gasket.

I have a set of the openchamber heads and regret buying them would have been much better to change the shortblock to work with closed chamber heads.