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I used to have a mild (stock) rebuilt '69 440
in a C body Chrysler. The cam was the Mopar
.455 lift hydralic,stock 906 heads with just a 3 angle valve job, 1-7/8 headers,CH4B intake,
and a Carter 625 4 bbl. The car would fall flat
in the upper (5,000) rpm range and run out of steam.

I went back in it a year later, changed to the
.509 cam, put a Holley 3310 750 4bbl on it, and it was a completely different car! Took it to
a local track and did a best of 14.10 @101mph
After that I always stuck with the Holley.

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