Cam for a 318

You’ll be cutting more than .010 off the deck to get it to zero. Is there a SM head with a 1.88 valve? It’s hard to go down that far in valve size and get the valve job right.
Pistons are advertised at being 0.012 below the surface, so wouldn't a 0.012" cut do it? I'm buying the heads bare, wouldn't the value seats be uncut for a valve size?