I have seen posts were guys are running Edelbrock 1409 on 454,s. I just want to get all the opinions I can before I buy them. The boat is a 1975 Chris Craft TSF, she had 350's from the factory. I replaced them with 454/350hp coupled with Hurth 630A's, the dry weight is 18000#. ie,it is a real slug. I usually don't run over 3000 rpm trying to stay out of the 4bbl. Would I see an improvement in fuel milage? And is the 600cfm provide enough fuel? Thanks for the help.