That's an early 70s emmisions carb.
Lot's of things were done different and very specific for the application.
If you have the whole setup, and are running close to stock, you can prob do some minor tweaks to increase the range of adjustment.
That stuff was all set up for fine adjustment of relatively lean idle (14.2:1) and high idle rpm.
Shop manual and theMTSCs cover most of those changes.

If you want it to be more like a normal pre-emissions carb. Take a look at what Mike did here.
https://www.tapatalk.com/groups/racingfuelsystems/list-4668-t1344.html

Take note of the booster notch and other staggered restrictions Mike found - that's specific to work with the intake manifold for best distribution.