Hopefully someone can help me out with this. Motor is a 307 bored and stroked to 333. Prior owner had it built and swapped in in 2009. It has a Holley 650 4bbl. I am unsure whether the carb was new or rebuilt at this time. If the car sits longer than over night it takes several 5 second cranks to start. I do two pumps then turn the key to start it up. It fires up strong then stumbles and dies. Once it's running it runs good and starts easily so I'm thinking maybe the choke is the problem. The other problem I'm experiencing is that cold or hot the engine will die after a quick stab of the throttle. It happens most often when parking or in a k turn like when I'm in drive, go into reverse, and then back into drive. If I accelerate in reverse then stop and go into drive it will die suddenly after I let off the gas before I can shift into drive (no stuttering or choking out that I can tell). I feel like this could also be a choke issue, but I am not sure; I'm still pretty new to this. Trans is a T350 if that makes any difference.