I have a 1984 Monte Carlo. It had a 305 Engine in it. I replaced the 305 Engine with a 350 Small Block that I got from one of my wife’s co-workers. This 350 that I put into the Monte has been sitting outside of a vehicle for about three years. The guy said he “greased” and “turned” it regularly.
Along with putting the new motor in, I have also replaced the carburetor and the fuel pump. They are both Edelbrock.
But I have got problems! I finished the car Sunday night, tried to fire it and it wouldn’t even turn over. Fixed that problem. It will turn over now. I can smell the gas. The carburetor shoots flames. The car will back fire. But I can’t get the d@mn thing started! I have checked the timing and it is good! I have tried changing the firing order to a different way that was suggested to me. That didn’t work either!
Does anyone have any suggestions? Can anyone help me out? I have GOT to get this car up and running!  

sounds like the firing order is not right,bring number one cylinder to the top and pull the dist.cap off and make sure the rotor inside the dist is pointing towards the number one cyl. it is possible that it is 180 out if so you can do one of two things pull the dist. and set it in the right spot or where ever the rotor is pointing with number one cyl. at the top make that number and put your number one plug wire there and start your firing order from that point. if that doesnt work then tell us what year the 350 motor is  

Make sure the guides aren't corroded and a valve isn't stuck open.