I had one off an 85 burb and I ran it on my 68 327 for a while and it ran great! I didn't do anything to it just left that top blue electronic plug alone and bam - it ran well. I also put a carb just like that one of yours with the extra white electronic plug on the side on a 72 Impala that I put a 4 bbl manifold on and a Q jet and it ran well with no electronics hooked up. The bottom 3/8" vacuum goes for a PCV.
The red circle in the back is a vacuum hook up for the vacuum power assist power brakes. The small 1/8" vacuum line can go to the vacuum advance on the dizzy.
Your fuel inlet is in front pointing to the left with the case labeled <- INLET.
Good luck with your project.