hes right, scan but you can probly run a 3.25 pretty easily with those headers,
are you going any farther with the car, if so leave the 3.4 on till you decide what your going to do, then buy the right pulley, a 3.25 will give you very little over a 3.4 and will give you slightly shittier gas milage from what ive seen,and will casue more engine heat, keep it as a track pulley if thats all, but if you get rockers and maybe a power tuner, you could go smaller then the 3.25 is a waste of $