u/Old-Actuator-4817

I took my Chevy 350 to the block. It was seized from water entering through the intake. Please note, I have zero experience as a mechanic, so everything I learn to do I learn through YouTube.I was able to un-seize the motor, I honed the cylinders, replaced all the vaulves, seals, and push rods, cleaned the heads and block, and reassembled with all new fresh gaskets.

Then, I put on a brand spankin new AVS 2 Carburetor, and then I started it. It started pretty good and it sounded pretty good and then after maybe like 10-15 seconds after sounding real good, it turns off and fire shoots out the carburetor (see attached video for reference). What is wrong with it and what should I do next to help fix this?