1972 Suburban (Plymouth Fury III Wagon) TUNE UP HELP

My car has the stinckys!!
I have the 400 engine with electronic ignition. Since I got it I have struggled with smelly exhaust. I did read the posts and pretty sure my tailpipe is stock angle and my windows are closed. I did changed the valve on the air pump and it seemed to run smoother and helped the smell go away a little.
I got some good advice here about my 68 Newport 383 that included the use of a vacuum gauge but I didn't get one. Well, I got a gauge and want to do the best I can to...

1972 Suburban (Plymouth Fury III Wagon) TUNE UP HELP
Author: MBar