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I believe it should work, one of your older model 3750s, with IPServices, should, by default, win the stack master election. As you also have two of those, if the stack master fails, the remaining older 3750 shoud win the stack master election.
BTW, a mixed StackWise and StackWisePlus stack causes the stack to operate in StackWise mode, negating many of the improvements found in StackWisePlus.
