What caused this?

I have not checked the sending unit sock yet. I did 2 passes and it did the same thing. "2 Shelbys" - what kind of damage can fuel starvation do? I hope I didn't mess anything up. The edelbrock 500cfm carb has recently had larger metering rods and jets installed becasue it was running too lean. Felt better after that but I have yet to pull a plug to see if there is any change. I can't remember the jet size off the top of my head. I do have 318 manifolds, no headers. The only headers I would buy are tti's but im not spending that kind of money for 25hp. I know for a fact my rear end is really killing me off the line. It's a open 2.76 8 1/4. Something better will come in the near future. But taking off was fine, it wasn't until a little after the halfway point it started bogging so I let off the gas. If that didn't happen I think I would have ended up with a mid to low 16 second et. Im not sure what kind of fuel pump I have but I will get a new one, probably a holley. My goal now is to get that fuel problem straighten out and get some gears within the next few months. I'll be taking my car to the Mopar Nats next week and hopefully I can find what I need.