The only way to tell for sure what straight 100 will do in an SRT-6 is to try it. You could run the tank down near empty and just try half a tank. If there are issues you have the option to cut the octane down by adding 87 or 91. But increased compression and forced induction are not usually compatible, and without accessing or overriding the ECU code you don't have any way to change the air/fuel or ignition timing to take advantage of the additional anti-detonation margin that 100 octane should provide. If you don't see any performance difference going from a 25/75 racing-pump blend (~ 93 octane) blend to 50/50 (~ 96 octane), then why go any higher? Even if it doesn't damage anything it's still 6 bucks a gallon.

Please post your observations if you do try the straight 100.