you have headers, rockers and an intake a 3.4 pulley is all you need with Matts tune. jeffs car runs a 3.4, my old L36 ran a 3.4 and i went 13.0 and trapped 104mph all day at the track rental. you really think a 3.6 with 2 extra degrees of timing is going to matter? man up, buy a used 3.4 pulley from zzp and come down to the shop