340 Stroker mainly for street, what gear would you run?

Old school rule used to be 3.23 was the big block gear and 3.73 was the small block gear. Since it's got the torque curve of a big block now with the extra stroke, it'll have no trouble pulling a 3.23 or even the 2.94 that @abodyjoe talked about. It's gonna have gobs of bottom end torque.