You know your cars/mods well 
I DO have much smaller pullies sitting in the garage, along with my software, so I can tune accordingly, however pulling near 775rwhp out of a stock block, uhm… doesn’t sound like the safest thing I can do.
The car is quick, but keep in mind, I have 100lbs of dynamat, 102lbs of stereo equipment, full-length subframe connectors…etc. , but against a 3000lb z06, I dunno… if I was a 3rd party, I’d pick the Z06. 
I would like to check your car out sometime, I’ve never even been in a new one yet …they look badass from the outside.