I have a 449 and a 270. The 449 is the original for my 68 400. Both have 524.
My understanding is for 68 models, the 449 is for manual trans, 270 for automatics
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express
2024 Cadillac LYRIQ
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