Duster running rich

It was built by an engine builder in Southern Missouri 20 years ago basically. My uncle only put on about 400 miles in almost 10 years. I remember him having issue back then. I dont know what they all were but I do remember it blowing a freeze plugs. When I got the car there were literally 3 carburetors 3 fuel pressure regulators and he couldn't get it to run. I have done a ton to it all ready to fix issues. Unfortunately for me carbs and tuning aren't my specialty. Im going to start with timing and see if I can get this figured out. Again I appreciate all input