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Porsche was not sloppy with engine numbers on production cars. If it was a 1974, it came with a 1974 engine. You can verify the original engine number with a COA. Note that the 1974 2.7-liter North American engines were much better than the 1975 versions as they didn't have the thermal reactors. And yes, a replacement engine typically hurts the value.
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74 Carrera 2.7 | 75 Turbo 3.0 | 97 Boxster | 12 Cayenne S
GONE >> 04 GT3 | 75 Carrera 2.7 MFI | 76 Carrera 2.7 MFI | 77 Turbo Carrera 3.0 | 86 Carrera 3.2
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