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The pulley wont tell you if its internally or externally balanced or if its a 428. All FE's have neutral balanced balancers.
The difference between those two balancers pictured is pre-67 and 68+. Early versions had an integral pulley, but they are interchangable.
If you can see the flexplate (flywheel) that should tell you if its a 428, assuming its the correct one for the motor, or if you can pull the pan. It will have a distinct counterweight on the flywheel on one side.
Only other option is to measure stroke through the spark plug hole
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1994 ERA Cobra, 496 Genesis FE TW (new addition to the stable)
70 Mustang Fastback, EFI 489 FE TKO-600, too much to list
71 F-100 4x4 EFI 461 FE restomod
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