Wow...umm I am new to TR but I've been on 3zc for years. You should really check that site for technical info. (300zxClub.com (Nissan 300ZX Forums) - Powered by vBulletin) Z32's these days are making just under 500RWHP on STOCK turbos. I'm really not sure what "hybrid" turbos are and I've had my Z sin 2003. If you ask the Z experts the aftermarket side mounts are much more efficient than a big front mount. The stock internals are good for around 550-600HP so your Wiseco rebuilt should easily handle 600H...800HP if well tuned. Like was said earlier the head work is not going to show much improvement at this level but will come into play as you up the power. You failed to mention what pressure you're running your boost controller is set to or any other mods you've made so I have no idea what HP you'll make. I CAN tell you that I made 423RWHP on stock turbos with a ton of supporting mods. As for the injectors...in a Z you can pretty much equate what HP to injector size. i.e. 555's are safe to about 500HP, 740's to 700ish HP, or 850's to around 850HP. Take your pic.