No comment on that power part, seeing as you probably wont either. W58 on the MkIV may be stronger, but more its more than likely it wont be as robust as the V160. I think I'd get a Hilux/T100/Tacoma and 7M-GTE swap before I got a MkIV anyways as of now.

Let it be known however that I am easily entertained, I dont need more than 80mph or 20psi to pretend I'm going "fast". Also, my driving habits for the most part will not completly change. Unlike many others, I dont chose between full brakes and WOT to get around, in fact if anything I'll go too slow around regular town (always in the right lane, and Venice is much smaller than Tampa keep in mind)