My stock everything '67 started acting like the carb was fouled, chuga-lug, chuga-lug, not getting the fuel it needs so I decided rather than just clean and rebuild the 2bbl Stromberg, I might as well do the upgrade I've been planning. So I swapped the intake for a 4bbl. 2806301 cast intake and installed an Edelbrock Performance 1406 carb (based on guidance from this forum), new fuel line and filter from pump, new gas tank, flushed the fuel lines, etc. Everything went together well and looked good. Fired up and ran great for approx 12.65 seconds and right back to the chuga-lug, chuga-lug, not getting the fuel it needs symptoms again. Same as before. The fuel delivery system is totally clean and the carb is protected with an inline filter so it stands to reason that fuel is likely not the issue. So what is? Maybe a vacuum issue? Any ideas from MOPAR aficionados?