Chris, where did you see the "SENTNEL" plate. I have a "connection" to the guy who played 'The Sentinel' on TV.
The best plates I've seen around are:
"POLOCK" - this was hung updside down.
and
"32 SOHC" - on the car in my Avatar.
I also saw
"AHOT440" on a 69 charger. Didn't have a car that was race worthy at the time. I'm looking for that guy now though.

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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13