This depends on what you are wanting to do with it. If you want the milage and your vacuum sensors, hoses and switches are in order, a rebuilt or good used hitachi is a good idea. Sounds like you want to go the mod route so the hitachi may not be quite enough.
As far as the webers, I had a weber 34 dgav with electric choke, and I didn't care for it. I'm starting to think that it's a knock off. If I were to do it again, I would go for a 32 36 with water choke. I liked the way the water choke worked on the hitachi much better than the electric choke on the weber 34.
-Adam