troubleshoot help

Hello, I am looking at a vehicle that has a rebuilt 350 Chevy block in it. They said it won't start. It doesn't even turn over, or click, or make any noise. It's not the battery, as lights do come on, and they've tried different batteries. I'm thinking this could be an issue with the starter...

I have a 3310-4 (750 single pump dual feed) that I bought and installed 20 years ago. The car sat unused for about 5 years so I decided to rebuild the carb. I got the kit from Holley and thought I did everything right but when it cranks over I get a fountain of fuel coming out the rear tube...