Gasket matching question

Gonna try to gasket match my cylinder heads and Edelbrock Performer (old) 318/360 manifold.... casting 714, very similar to 302.

See pictures below. (I hope they come through, this is my first try at attaching pics.)

First one should be the cylinder head intake port, and the second one the intake manifold port.

I placed the gasket against each component and traced the inside of the gasket with a black sharpie. So the black you see is the material that I propose to grind away, to match the gasket. Seems like a lot of material. So I thought I'd ask about it before I grind away.

Am I doing this right?

Grateful for your responses, I am,
JD