Come on guys, lets be realistic. It's a stock 99 split port 3.8L. It makes 173rwhp NA. It's going to run on pump gas.
It has stock hyperutectic pistons, a stock cast crank, and powered metal rods. It has stock valve springs and stock cam. Yes, it is STOCK.
On a good day 1psi boost can net maybe 15rwhp. So 10psi could maybe net 150rwhp. To get from 173rwhp to 500rwhp will require 500-173=327/15=22psi. Not happening. How much boost is safe with pump gas on powdered metal rods? There is no way we can run 20psi. Like I said, not an option to blow it up.
If everything works well at 10psi we might make 325rwhp, but I've also seen 1psi netting only 10rwhp in which case 10psi would net 275rwhp. If we do make 325rwhp, that would be pretty impressive considering the most I've seen an SC make (even highly modified) at 10psi is around 295rwhp.
It will be interesting to see how the motor responds in terms of HP/psi.
I guess I should rephrase the question - how much power do you think it will make at 10psi, and how much do you expect it will make at 14psi? I think that's as high as we will go on a totally stock 100k mile motor.