I can not really comment on your timing, since I do not know what the AMC engine "like" but full adavance by 2800 or so would be more inline then where you are at. As far as initial, have to just see what the engine likes.
Weber wise, the great thing about them, is thier ability to be tuned for just about anything I'd say. You can change venturies/chokes to alter CFM, emmulsion tubes,jets,etc,etc are all very easy to change... you can actually get to the tubes and jets with just the unscrew of a wing nut.
I posted a couple of pics in the Mopar section, have a look if you are curious
