I think you may be confusing uplinkfast to just have fast convergence time.
Enabling uplinkfast on 6500 is not going to help. If you are sure this is non-loop network, try portfast. Please understand this before turning it on. If you don't understand it and enable on looped network, you would cause STP loop.
Another thing you can do is to reduce the diameter and hello intervals. again great caution is needed here
Why don't you try tuning STP Timers...this works good also if you're not able to recover so fast (1 second) as UplinkFast (Remember that uplink fast can be implemented ONLY in some network desing)
We have some Gigabit Campus with STP on and timers customized (Forward-delay set to 4 instead of 20) and it works fine with a good convergence time (approx. 5 Sec).
Please as already you know before tuning STP timers study and analyse which potentially impacts could your network have (especially if you connect a switch which has not the same parameters configured!!!)
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