lets just say a stock pulley on a top swap is as strong feeling as a 3.4 on a l67. your not running a 3.4 with out a ic or corn. or lots of timing pulled form the tune.
3.4 on my set up pre ic was 6ยบ kr at part throttle. i just took it off and put the stock pulley back on, to kill 6 degrees kr you need to pull way to much timing, and that was part throttle, not even close to wot.