Magnum head porting for the beginner

I have basically zero Magnum Head porting experience.

I did a 5 minute blend on a set of 3.9 v6 heads for a guy I worked with....... over 20 years ago...... that’s it.

So...... what’s the story with not touching the floor?

Edit: I thought you had mentioned staying away from the floor, but re-reading it, I didn’t see it.

How long would it take you to duplicate that port?