Lots of great replies to this, but unfortunately nothing really worked well, so here is my next question.
I'm looking at a couple of holley 390 cfm carbs. How do you think those will work on my motor (283 bored .030 over, heads ported and polished, mild cam)
I don't have a fully ported 283 ci, I have a fully ported 173ci.
This engine is fed by a single 390 cfm carb. All it really needs is 360 cfm.
So if you do the math, your engine likely only needs 1 of those 650's.
It will run rich because with 2 carbs you have so much idle and jet available for your cubic inch capacity. Is it bogging on you? Seems like a good candidate when I think about it.
If you really want a dual carb intake, I'd seriously look at 2 small 2 barrels. But if it was my engine, I'd be looking at about one 600 double pumper as the biggest carb I'd put on it. Just my .02
I would only go with a single carb. A 600 CFM Holley 4010 will work best.
You can try the 390s, but overall you will never get the performance of a single carb.
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