[SupraMan1784]

redo the gear timing....u might have to retard it back a couple degrees.. not sure how many, im at work right now so ill try and reply back when i get home, it should do the trick...since i assume u are running the factory timing, the backfire shouldnt have anything to do with the i/c piping or that fact that you did not recirculate the bov, cause all recirculating does is basically reusing the boost u made alrdy...