stall after burn out

could use a little help boys.318 with 600 VS Holley 904 tranny from a dead stop i mash the throttle light the tires real good,don't know what the last guy did to this little motor,all i did was put on a edelbrock rpm intake and the 600 Holley it goes great,but once i let of the throttle it stalls ,starts right up so flooding cant be why it stalls out and pointers.Timeing set at 15 ,total 32