Check out this page from INDY4X

You might want to perform some scheduled maintenance before throwing your 75,000 mile VX right into a trail of Hell. Then I would say it probably wouldn't fall apart!

Bart made this nice how-to

I also understand 3.2's and 3.5's benefit from a valve job more than some other motors but can't back that up. Speaking of 3.5 woes and worries (for some) I would also try to add something to the crankcase to monitor oil level and temp perhaps. Use a high quality oil - I recommend Royal Purple personally.
Check out some discussion on an electric_fan

Since you want some go fast in your wheeling you really should gear down to compensate for the big heavy tires which also assists in your trans' survival - same holds true for go slow... go figure! Light weight forged rims should improve your times too.

Post some pics of this VX you want to thrash!