I don't think the 670 carb is too small unless your trying to do something wierd like haul a full size car on a 16 ft trailer, which I'm sure your not.
They built plenty of 455's with regular old 2bbl carbs, so no, I think thats a non issue.
Might be a little or a lot lean on the idle fuel part of the deal as Cliff has suggested and that could be a problem, but I'm not up on the carb circuit stuff though like he would be.
Anything you can do to reduce carbon would be good, but knowing how much there is or isn't would be hard to guage.
Check over the stuff this weekend and let us know what you find.
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