You're probably right .... but I wanted to rule out everything else before blaming the carb. I also had to replace the water outlet (thermostat housing) and in the process I eliminated the top temp vac sensor that the vac advance for the distributor runs from. The stock setup had the sensor...

:headbang:1985 Ford F250 460 stock holley/motorcraft 4180 carb. Truck starts fine and idles fine. Once I get up to freeway speeds the problems start and even remain after I get off freeway and am driving back roads. At cruise speed things seem ok. When I give it gas it hesitates and...