just take the complete head to the machine shop. Have them port/polish and put oversized valves into it...but leave all of that for the machine shop to do.
all of the block work, let the machine shop do. idk how much you will be able to bore it since its open deck. Isn't stock bore 93mm? Taking 7mm off of the metal might be a little too much.
the main journals are likely fine, but the machine shop will be able to take care of them for you if they are not.