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Re: Performance
Probably headers would be the biggest improvement (in performance, not livability) you could make for cheap. Manifolds are very restrictive.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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