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I just put a edelbrock 1407 on my 413 last week. It replaced a 830 holley with annular downlegs. I basically had the same problems with the holley as this post and the 750 edelbrock fixed it.
The 830 no matter what I did, I could get out the sputter on quick acceleration. It was also too rich even with jet changes, power valve, etc... I used to think I knew holleys 
I know how frustrating it can be, but the best thing I did was try another carb. Had a 1406 sitting here and it was like an instant fix, but the motor wanted more fuel unlike too much with the 830.
Far as et, fuel economy, etc... at this point I don't care about any of that. I'm just happy the car runs good, not pig rich and not sputtering 
413 with a stock/mild cam?
It has the bigger summit cam and it has 906 heads, so less compression than a stock 65 engine. It also has one of the 50 dollar ebay stand alone hei style distributors.
Probably just too much vacuum pulling on the annular boosters, they're sensitive for big cam/low vacuum cars. I've never fiddled with one with annular boosters myself, I kind of want to try one on my engine because it pulls only 9 inches of vacuum at idle, but I don't want to drop 500 bucks and be sorry I did 
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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