When I first bought the parts from In-Line, I ordered the '67 booster as well, not knowing the '66 should have a 9". I drove the car with that booster for a few years until I swapped it for a correct 9". Never noticed a difference, but it certainly looks better under the hood..
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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