Ipulled out a318 with a2 barrell carb installed 383 4 barell I have the factory 5/16 fuel line and new factory pump on heavy acceloration from stop it tries to die then takes off and acelorates fine do I need more fuel

Sounds like the accelerator pump circuit in the carb is not squirting fuel in when you depress the accelerator. That is why you get the lag in acceleration before it decides to launch. When you open the carb you should get a steady stream of fuel from the accelerator pump. With the engine not running look down the carb throat and open the throttle blades and visually check to see that there is a stream of fuel when doing so. If not time to rebuild the carb, or just get another accelerator pump for
the carb.