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thatsa a big meatball!!
i would be looking to idle in the 1200 rpm at a minimum, with the 108lsa and duration you are going to get a lot of reversion in the intake at lower rpm's, probably why you need a lot of advance, with the higher rpm you might not need as much advance initially. i'll bet your cruising is going to require a 2500rpm range to be happy or more than the 408 will or than you are used to.
i think the street carbs are usually set up to be used on higher vacuum engines, probably using dual plane intakes, yours is not pulling much vacuum which the race carbs are usually tuned for.
you have a lot of information, i would sell the present carb, call aed and give them the info and have them make a carb, pay the money, be happy, and enjoy the driving season. i'll bet you end up with a bigger carb also.
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