the first thing you learn when getting into any motorsport hobby (cars, marine, offroad, etc) is to NOT throw parts at a problem. does it die when you're easing into it or when you jump on the throttle? motor stalling at 3k rpms isnt very fun, especially when your wake catches up to you. does it fire up right away after it dies or does it take a few cranks? mechanical secondaries or vacuum? HEI ignition? whats going on with your fuel lines from the tank to the carb? what diameter hose, any filters, etc. Can you get it to rev over 3k on the trailer? Post up some pix of what you're working with. Where are you located?