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I just had an issue with my 670 Ultra where the factory incorrectly put the 63's in the secondary's and the 73's in the primary's!!! It was bogging when my 351C hit 3rd and 4th. Holley gratiously gave me a new set of bowl gaskets. I then opted for a pair of 68's in the front and stayed with the 73's in the back. All is now good, what a pain though. worth double checking if your new one is acting up. Be sure to have new gaskets, these bowl gaskets are good once. Part # 108-83-2
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