Sounds like you have that car overhauled pretty good. I didn't see anything about transmission but that may be something to monitor. The 6F55 is pretty stout but the stock converter will eventually crap out. Also saw you got a new PTU in there definitely want to drain and refill that regularly. Do not slack on the PTU maintenance with that added power. I'm at 130k miles and just did the waterpump and timing chain set and car feels really strong easily pushes 15psi on Livernois tune with stock PTU, tranny etc.