Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .

Boring a block is a machining operation preformed with the proper equipment by people that know how. I remember my first at tech school. The instructor was right there making sure it was done right and we did it with a proper boring bar. If you think you can do it with a drill press you are sadly mistaken and foolish for thinking so. Think seriously about the rabbit hole you are going down. (I am thinking you are serious and not just clowning around)