600rwhp can be had on a stock bottom end. It's just a matter of how you want to do it. You can do it the easy way using F/I (roe, paxton or tubos) OR the hard way N/A.
I know of a larger single Turbo Viper making 950+rwhp on a STOCK motor (or so they say.)
Disturbed, when you say the hard way, I'm guessing you mean labor intensive. If that's what you mean, I guess you are correct. It's also probably going to cost more as well, BUT and I mean BUT it's probably the easier method in the end. The reason I say this, is because the majority of the car stays with stock or similar to stock systems. No new computer or piggy back system that youv'e got to mess with. N/A motors are not as fickle as blown or turbo engines, factory fuel sysytems remain UNTOUCHED up to 600+ rwhp. All stock emmissions components can stay in there original untouched state. No additional weight over the front end, no methanol injection or other failure prone impractical add ons.
Believe me when I say I agonized over the decision to go N/A or blown. Had I had a forged car, I would have gone with the Roe System. Primarily because I am one of those nuts that likes to tinker. In my case though, owning a cast motor car as well as an ACR, I felt that going blown would result in a destroyed motor. This is because I know myself, and I would have immediately turned up the boost. I also felt like I wanted to keep within the original framework of the car. I thought an ACR should remain a handler, and I should not add additional weight (100+ lbs) on the frontend. The Paxton was very tempting because it has CARB certification, but it has a few items that I just can't get past. In my opinion the bar that's provided with the kit to replace the factory crossbar, comprimises the rigidity of the frontend. The air intake setup and fittings do not meet my standards either.
So what I'm saying is that, no matter how you slice it, it's going to cost you in the end. My car runs best on good old 91 octane. No detonation, no hassles, no crank pins etc., blower heat soak and it looks stock. It would have cost a small fortune if someone else had done all the work, but that's what I love to do.
Willow sounds awesome, though we've got family coming into town this weekend. Who knows maybe I'll sneek out!