Engine trouble.

[THE "10" SILVERADO]

Okay, this might be lengthy but I'm trying to do my best troubleshooting.

350, 2 barrel carb (truck originally came with 305)

Last Wednesday, truck really started to run rough at idle and felt like I was in a really lopey car vibrating back and forth. Also started to to delay when on gas and acted like it wanted to die if I barley got on it.

Next day. Won't run at all. Barley got out of the parking lot at school and died everytime I slowed down or turned.

Once I got home I took apart the air cleaner and it seemed like the butterfly wasn't working properly. I tied it open to see if that was the problem but the engine wouldn't run at idle at all.

Jump to today. I was finally able to get over to my mom's house to work on it. I figured the fuel filter might be clogged and took apart the two nuts at the carburetor to find NO FILTER. I checked the lines and there is NO FILTER BETWEEN TANK AND CARB. Took a trip to parts house and got a filter and carb cleaner. Come back and the filter is to big. The thing is like 1.5 inches long and is to long. I got everything specific to a 350, 2 barrel carb. Maybe the carb was on the 305 and transfered? Are there a difference in 305 carbs and 350? It was getting dark so I couldn't run back to the store.

I sprayed everything down VERY good with carb cleaner and the thing is running okay for now. It is still a little lopey to me and lags when I get on the gas.

Now here is the question. Since there isn't a filter and I have the wrong one what type of filter should I look for (for the carburetor)? Also what else could be causing these problems? I have no idea. I'm thinking maybe the timing is off or something?

Any help is GREATLY appreciated because this is supposed to be my daily driver.