when this happened on my cars, it was the secondary fuel bowls being to high. try lowering them. when braking and turning hard, if the level is to high, the fuel gets pushed out the boosters. I have my fuel level just below the site plug.....

68 cuda formula S 588" bb 5sp
70 CUDA CONVERT 500" 5SP (SUBLIME)
70 CUDA CONVERT 500" 5SP (PLUMCRAZY):TOO MUCH HORSEPOWER, IS ALMOST ENOUGH!