Holley Guru Needed

I have a 3310 on my Duster. They make a metering block kit that comes with the block, gaskets and screws needed to install it. The secondary metering block has no provision for a power valve. I don't know about the jets. Mine has 4 different jets in it. The primary side has 70 and I think 75, the secondary has 73 and 77. I have NO idea why. I'm trying to find a good starting point for installing jets and tuning my carb. :dontknow:

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