Bfore you start dropping pulleys, go headers, down pipe(catted or non), air intake, some autolite 104 plugs, 180 t-stat, and a good tune. Then you should be able to drop to a 3.4 pulley. Throw in a cam and I don't see why you won't be at your 13.4. Just make sure you have all your supporting mods for the pulley before you put it on. Remember, KR is not your friend. Not good for the motor and for every degree of KR you'll lose 2hp.