Yep, even as a rookie carb guy, I purchased Cliffs book and also used some helpful recommendations from LARS. By the way, I would like to send some business over to LARS, but the distance thing is just not working out...
Anyhow, I have built 3 different qjets following Cliffs book and parts, including a 72 Pontiac, 74/75 Olds, and a 79 Firebird from a 301. My favorite was the 79, which has a larger bore flowing at 800 cfm compared to most at about 780. Funny to have that carb on a 301, but the factory limited its flow abilities by not opening the flaps all the way, larger rods, etc. These newer carbs also have the APT adjustment that can be easily be drilled for external access. I just finished the 79 carb last week, and it was dang near perfect from the moment I bolted it on the car!! It is a little rich for my stock 400, but thinking it may be real close for my upcoming 455 this winter.
Regarding your older carb, it will work just fine with the correct rebuild. However, if you were not concerned with originality or needed a new core for building, look for a newer model such as the 75-79. Again, great info on the differences, etc. in Cliffs book. Just stay away from the 1980 or 81? units with the computer control modules. You can also use chevy versions. Only difference really is the fuel inlet position.
Good luck and go Qjet!