My old 3 liter would hit 95mph easily and still have more pedal. This newer one would go faster, I'm sure. I've only one good testicle remaining and don't intend on losing it via road carnage.

Are you sure your vehicle is going into overdrive? Silly sounding question, but I had to ask. Maybe something to do with your TPS adjustment/kickdown cable adjustment concerning shifting.

I also wonder if your fast idle air valve (lower part of the throttle body with pipes) is leaking coolant into your throttle body and on into your cylinders. I've been down that road and it looked alot like head gaskets blown by the way the exhaust looked...and smelled.