Trouble running when first starting

change the rubber from the tank to the pick up line 10 - 1 its cracked weatherd and rotton . its only about 4 inches long ,look there first sounds like you don't have a solid pick up flow follow that to front then and check clamps at fuel pump then cgange filter ,if that doesn't help its a mopar they start hard but run awesome lol check all the way to carb and distributor you might want to change timing chain to a double roller but if not in line , it sounds like its in the filter or carberator. gl if its the duster take more pics and sellit to me cheap lol