Hey Luis,
aa-fuel is corrrect,In the Santucci book it actually shows a picture of this machine,It's a duplicating mill that "traces" a pattern and machines the part. These were precursers to modern CNC machines.
The challenge you up against with using epoxy only is duplicating your port profile to keep somewhere near matching flow charisteristics in each port by hand.This is why Sissel's uses a machine to profile their epoxied ports.
You will have to do one port to your satisfaction then make a series of templates and gauges to use to replicate your work in the other ports, this can be tricky and time consuming to do.This is why using a "lump" that is pre-made would give you more consistency. That is to say you already have a consistant shape to apply to each port and by using epoxy to blend them, your "hand" work is minor and the potential for differences is kept to a minimum. Consistency is the key to a successful port job on any engine so you don't end up with one cylinder actually working against the others.
The best epoxy I have used is Devcon, it's an industrial epoxy and a little pricey but it's stronger than most others. Marine-tex and of course J-B weld are easier to find and less expensive.
If you really want to be able to check your work from port-to-port there is another rubber like product out (sorry I don't remember the name) that you can coat the inside of the ports with. When it dries you can remove it from the port and have a "casting" that you can compare with those from the other ports and even take measurements on.
Hope this is helpful , sorry for the long post.
'Crockett
