Mine is lasting well so far, haven't had any bad batches of Caltex yet either according to the wideband anyway. I did hear it pinking once on cruise one of the hot days we had, but its running 18:1 there for economy atm.
Im not scared about the little VQ, seen many stock VQ30det's pushing big numbers (400-450kw) and the VQ25det runs the same rods, the main worry is the auto. Either way, I have spare engines and a trans here.
I doubt 400 is attainable with the auto, (I would be happy with 350) but a built RB with a GTX3076 would sh*t it in. I will check out the HTA76 further Lithium but I think the compressor housing is a little too big. Does it still run the Garrett rear?