If you Google Q-Jet you'll get more people that actually use the carb every day, and will tell you what to fix and to make it a better carb.

I have run many Q-Jets and tuned them. With the cam you have you'll have to drill out the air mixture screw holes to get a better idle, drill them 1 drill bit size at a time, till you get a good idle. Use number drills, not fraction size.
you'll need to epoxy the fuel well plugs under the bowls to stop dripping if they are, they will leak.

When you start to adjust, make sure you set the idle screw with a feelers gage in the front butterflies(and that the rear butterflies are closed), then only use the air mixture screws to get the highest vacuum, and to get the right idle rpm's. I would put your timming at about 16-18 deg's with a stock HEI, and without a 4 deg key(if you don't have one)

Guru's aren't always the best way to go. A lot of them only know what they read, no real hands on!

Pat