Ko-lek-tor is correct, check Holley Tech, actually a gap measurement posted. I do not know it off hand. If he's got the old 30-30 in it ,it's choppy but not overly aggressive. Brakes were fine without an added vacuum reserve tank. Plus the tuning specs for that Z motor has long been in print
Not saying to go do it, but I ran a far more radical cam and had the best luck drilling a small hole in each of the primary throttle plates....per Holley. Never could adjust them open enough to not take out the idle circuit. World of difference. Experimented with accelerator pump cams. (duration) Ended up with a surprisingly crisp ,off idle set up. Must for the street. This was on a 850 double pump.
If I was a betting man, I'd say his problems are in the 46 yo. distributor ....certainly was not a mistake having that old carb gone through also.
Be patient Danny ,your not going to jump in a TEN year old car ,not knowing maintenance history, and honestly expect to have no issues. Also consider it presents as having little attention over the years. All in all ,relatively minor issues, as to be expected with theses old rides...half the fun of owning one.