What is COOL here in NH.
You can go to the web site for DMV & lookup what you want.
It will tell you if it fits on plate & if anyone has that combo taken.
Since I am a cheap bastard I use regular numbers.
But
I would do "Lil Six"
On the 87 T "big crnk" (big crank: the dirtiest thing I could get away with)
On the 383 barracuda "1tuffish" (1 tough fish-and it was)
On the Tahoe "Gas Hog"