Sorry, I don't have any advice on jets for Holley's. But if you are getting heads and a cam I would definately get a jet kit unless you are changing carbs. No carb, with rare exceptions and expecially Holley's, will run as well out of the box as it will with tuning. Some carbs are better than others in that respect but tuning will help any carb. I would get the kit. The $20 or so I spent on my carter kit was well worthwhile.
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