Motor runs like s--t until it warms up?

Hi guys the title says it all , just pulled the dart sport out of the garage after a long cold crappy winter. This car when its warmed up runs fine, its just starting this thing that drives me crazy. Every time i cold start this thing this is what happens. I pump it once the engine starts and then runs on of gas the it stops, if i pump it to much it floods easy. If i hold the gas pettle to the floor it starts, then it runs like **** and wont idle and can smell gas ,must be flooded. What am i doing wrong? Would the rpm airgap intake becausing this? I also run a 650 carb is the carb to big for a 318. Any advice is grateful thanks.