I just tuned a F1 Procharger on a 346 LS1 to 692rwhp on a Dynodynamics Dyno in Australia. I think thats about 760fwhp on a dynojet. This was on MS109. It made 620 (690hp) on our premium pump gas which is not that good.
This was using a 3.75" pulley and about 18psi at peak power. The engine has compression in the 9:1 region and is tolerating a good amount of timing.
The car is an auto and has a PY3400E converter and 3.73s.
It is an Australian VY one Tonner. Its a work ute that drives to building sites with a cattle dog on the back.
Here it is
http://www.youtube.com/watch?v=MBNiCY-Gxsw
http://www.youtube.com/watch?v=PxV-hOidPiw