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I have a 428 crank in my Shelby alum block, and the damper and pulley are separate, although in searching for a new damper, I saw both configurations of pulley / damper.
If you go to a fluid damper, you will have to go with separate pulley.
I am running the steel factory crank pulley, as it is a bit larger than the ones in the aluminum sets. and the factory larger dia. will turn the alternator and water pump a bit faster, which is helpful in hot weather stop & go traffic.
Ted
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