Damper spacers for serpentine belts?

[Stang_ROTY]

The damper I got is a 302 damper (for some reason that's the one my engine builder choose) with a SCAT crank and an SFI flywheel. The entire stroker kit came pre-balanced from a friend of my engine builder who runs a shop. Will I have problems since it's a 302 damper going on a 351? I know that there is a difference in balance between both motors but I thought when you get a balanced rotating assembly everything should be o.k. thanks

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93 GT, Dynamic C4, 8 pt cage, chute,
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'69 393 stroker w/SRP pistons, Edlebrock Performer heads, Performer RPM Upper & Lower Manifold..Crane Gold 1.6 Rollers Comp Cam..BBK 70MM TB, ceraminc shorties & H-pipe w/cats..30lb Injectors..Cartech Fuel System