Mileage Went From 20 to 10 With New Motor…Why?!

I used to get 20 MPG with my little street rod, 350 SBC, 4bbl on a small blower, 2100lbs, 3.0 rear. Then the motor expired and I replaced it with a new GM crate 350, the 260 HP version. Now MPG is 10. I can't find any fuel leaks, the motor runs fine and the plugs look great. Any ideas what is go

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