X2 on the couple hundred easy miles. Make sure there's no clunking or whining coming from the rear end. Make sure there is posi additive added with the gear oil. Then after the easy miles check to be sure the posi is working. Best way. . . Burnouts 
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/ [email protected], .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears
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