360 or 340 ??????

Asking that question usually results in a long debate between 340 and 360 fans. But since you put "neck breaker", it would tend to favor the 360 because it naturally has more torque and more cubic inches to start with. (A stroker tends to make the two more even, all else being equal.) A 360 will also be "streetable" because of the extra cubic inches. The shorter stroke of a 340 likes higher RPM's. But either one can be made to have "neck breaking" response.