I used the stock ones in mine but I have 3.55's. It is one of those things where you need to buy a shim kit and keep trying different thicknesses until you hit the right combination. What ever you take out from one side you need to add to the other side so you can keep the preload on the bearings right. I would first try swapping the stock shims to see if you might get lucky.
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89 GT convertible, Kenny Brown level 5, Edelbrock performer, AFR 165's, Comp cams XE270HR, C&L 76, 24# inj, Crane 1.7's, 70mm BBK throttle body 298.2 hp 328.2 tq Mustang dyno
"Our lady of blessed acceleration don't fail me now" Elwood Blues
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