More distributor/advance questions

I drove it up to the store and hit the gas hard a few times and didn't hear anything, so that is good. I'm not sure I got my air mixture screws on the carb correct since one of them didn't seem to do a whole lot and my tach was bouncing a bit with the motor (the Edelbrock instructions say to lean it up 20 RPM after finding the maximum RPM, but that is too fine a measurement for my tach). I think I got close, but I'll leave it like it is and keep driving it and see how it does. I'm pretty sure the throttle plates are as closed as they will be, but it still seems to want to diesel (it kept going for a second or so after one of the times it was shutoff, but not nearly as bad as before). If I cut the idle down much lower, it'll probably get really rough.

All in all, I have learned a lot from this tuning project (and it's probably not finished). I was hoping not to have to do it since I paid tons of money for the car to be put together, but, in the end, this is something I need to learn how to do on my own (and all of the help from this forum!!).

Thanks!!!