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Use the same PN from Belltech in the other companies sites. You can probably google search it too...What carb is on it now and what do you mean mild? Nothing more than 600cfm is required on any mild motor unless you plan to turn it above 5500 rpmsI personally only use Quadrajets.
A Holley 600 should work fine.Thats a nice build you got there.I really like your gauges.Good job