Holley carb size on 500 ?

airbrushguy

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What vehicle(s) do you drive?
1976 eldorado
I am almost complete with my 500 Cadillac into a 1949 Hudson project.
I used an aluminum manifold and a 750 Holley and was wondering if anyone has used a smaller carb on their 500. I have an electric choke and am not running any of the smog equipment. I kept the TH400 and added a chevy rear with 3.08s.
the Holley is new but if it sits for awhile it lets out black smoke at idle.
Just interested in what others have used.
Thanks
 

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