1974 plymouth fury stalling issues.
I have a 1974 plymouth fury, has a 360 small block, holley 600cfm 4 barrel, air gap intake, shorty headers and flow master exhaust. I purchased this recently and it ran great, drove it 2 hours home with no issues. The next day it didn't want to start so I broke open the carb and it was full of rust. I replaced it with a new one of the same model but with and electric choke instead of a manual, got it to run and it idles good in park but as soon as I put it into gear it wants to stall, driving down the road it stumbles and hesitates. Thinking it was still fuel related I changed the fuel filter and full pump. Still have the same issue, I also replaced the pcv valve thinking that might be the issue. Any suggestions would be great I'm at a loss, no amount of tuning the carb has made a difference.