You may find there is no contentment no matter what one does with the jets. The 770 bogging is choking on not enough speed, there is all kinds of flow. it froze in the summer, and started all winter. that cfm stuff is for lack of venturi'd young minds called fuel injection. There are several other tuning tips on that page as well. I guess my 600 vac sec is too big for the 350 hence why it runs fine with downsized jets. Looking at the Holley FAQ page It says to take the engine size multiply it by max rpm then divide it by 3456. That said, given the performance heads and cam he's running, I'd probably suggest getting the 770 tuned for it. I have a 600 vac sec on my 350, even jetted down a size for fuel economy runs fine. Nothing smaller than a 750 on a 350? I suppose if it's a high performance motor that sees lots of time around 7000 rpms, that's fine, but on a stock type 350 a 750 is way too much carb.
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