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When I did an LT1 swap on my 1979 Z28 Camaro, I had trouble getting it to pass, even with an emissions-friendly camshaft and two high flow catalytic converters and the stock EFI. It had a bad knock sensor causing it to run a bit rich and didn't pass emissions until I found out that it was bad. Even with EFI and stock camshaft I doubt it would pass without cats.
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