452 heads cc's

.0055 is roughly 1 cc.
It might be faster on a broach but I surface iron and aluminum heads daily and it's quite a bit of time to get .022 off of a head and that only will decrease your chamber size by 4cc's
In reality the heads are likely to clean up at less than .010 so you'd be looking flat heads but not much less volume of a chamber.
Also for every .0055 your intake should be cut .011 to keep you bolt holes aligned.
I recently did my trickflow heads, I milled off .080 and to get my intake to sit down I had to mill .140 to get it close. I have adjustable rockers so I didn't need new pushrods.
To bad you don't live closer