170/6 build plus questions!

The 170 is considered a "zero" deck motor, however the deck clearance is usually .010-.020 down in the hole. The stock gasket was about .022, whereas the replacement gaskets are usually .010-.020 thicker. If the actual CR comes out to less then 9.0-1 (which I think it will) there shouldn't be a problem, that can't be solved with a little more octane, or distributor recurve.
I have a 170 that is at zero deck, with the steel shim gasket, that is a true 9.5 CR, with a mild cam, and it was a bear to tune the ping out, on mid grade fuel.
PS: Don't remember how much the head was milled
Also running stock exhaust manifold, and 2 1/4 inch to the back, and a 1 bbl Holley economiser carb