Having problems with a 350 need help ASAP

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I bought an 1987 c10 recently and the orginal engine was a 305 I'm thinking and the guy put in a 350 crate with engine work done to it. Well I noticed there was a lot of wires not being used and went no where. So last night I decided to start cleaning them up a little and went to cutting wires. Well that wasn't the smartest thing I've ever done. Now the truck cranks and runs but I hit the gas petal and it back fires threw the carb and doesn't idle anymore it just dies out slowly. They had a box that was connected that I took of that had numbers on it and c4.....and another TW with a diagram on it. A few guys told me the timing is off now but how can that be possible by just cutting dead end wires? Can someone please post a diagram of what I need to wire up and what I can take out?
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