[jhv48]

Being in Newport Beach, I am assuming you had Danmar Autobody do the installation?

Have it flatbedded to them. They will take care of it for you. The temp spike leads me to believe that the thermostat stuck shut.

The rough running is another problem, probably resulting from the temp spike. That could be an intake gasket or (probably not) a head gasket leak.

Mine did the temp spike thing. I had both the stuck thermostat and the leaking intake gasket,

Both repaired under warranty from Roush.