If you got high cr pistons and closed chamber heads no way it's gonna be an 8:1 engine, might not be able to achieve quench with the thinnest gasket but still should make decent cr, all you need to do pull it apart mill the deck a bit to zero and put back together for quench and a bit higher cr.
Sounds like you got a decent engine quench or not.
You sure about the pistons though?
