Holley 80457 leaking

I'm using this Holley 80457 on my Duster build and was set up for first start up of fresh rebuild mild 318
I bought the motor complete about 3 years ago. I would turn it periodically by hand and it was stored in heated space. As I turned motor over to start, and having good fuel pressure, the carburetor began leaking in the front and back. Another mechanic in the shop where I was borrowing a lift that day said the bowls must be stuck due to sitting.
This is a low budget build so please don't suggest I get an Eddie or TQ lol
What do I do? No experience at all with carb building or adjustments.
Any suggestions are welcome
Thanks
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