Oldass

I will soon have a set of Trick Flow 225s that will be going on a 408 ls1.The heads have been milled once and the chambers are at 60cc. I need to mill them to 57cc. My question is, will the intake side need to be cut? will the runners line up on the intake, or will they need to be matched? Can they be angle milled like old school small block.

Any info would be greatly appreciated

Roger