Okay, I think I screwed something up. I have a 350 recently rebuilt (1000 miles ago), edelbrock q-jet carb, XE268 cam. I took it out yesterday for a spin and got on it a little bit. All of a sudden it started running really crappy and sputtering every time I touched the gas. It will idle fine but when I touch the gas it sounds like I have no exhaust system from inside the car. I got it home and popped the hood to see what was wrong. When I give it gas, the carb pops like it is backfiring a through the intake. This is at any rpm above idle. Idle is also rough. I checked the distributor and it's adjusted in the right spot (didn't slip). I checked the plugs and they look fine. I pulled the valve covers and all of the springs look fine and everything moved up and down like normal when I started it. What else could cause this? It has a double roller timing chain so I don't think it would have skipped a tooth.