Saffs,
Many CIS cars have worked just fine with the early replacement sets, and I have yet to EVER hear of a crossfire or backfire problem turning up after the early wires were installed! Just as a bit of confirmation ... the '74 factory brochure shows 2.7 CIS engines at the factory with early-style wire sets!
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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