I think I posted this somewhere else, so forgive me if it's a repeat; however I am wondering with my set-up if I will need to bother with any shims changing to a 9510 - the OEM one did not...
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78 White T/A, Carmine interior, Fisher T-tops, WS-6 package, 3.08 gears, a/c, rear discs. Original 403 with 300,000 miles replaced by new Pontiac 455 (roller everything, 6x-4 heads, Performer manifold, Hooker Headers, Hughes converter, Cliff's Q-jet) - I only get 12 mpg!
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