Not long ago I worked on a customer's car with the same symptoms... Turned out to be the fuel tank - Yup...

Rusty ass fuel tank kept sticking the Holley needle valve open, flowing a river of fuel, made it "challenging" to start.. Also destroyed the blue rubber 1-piece pan gasket and about a handful of blue rubber was collecting on the pick up screen. Wish I had a picture, it was an unbelievable amount of rubber - especially since the pan was still not leaking !