engine math! milling heads + intake

Don't mill anymore than needed. Actually I would use a set of KB 167 pistons and cut about .030 off the heads and then cut .030 off the intake side. Or you can safely cut up to .025 off the deck and still bolt the intake manifold down without cutting the intake face of the heads. This will give a slight mismatch but not enough to worry about for a street car. By using these parts you should have somewhere close to 10.5:1 compression, or just use the KB 167 pistons and end up about 9.8:1.