I will try to explain this the best I can. Sorry if its long but i want to be thorough.

I have an 87 Chevy Short bed pick up with a 350(not original engine). Has been switched to carburetor (quadrajet). pretty much stock other than that. It was running great until the other day. It started acting up when i would first start it to warm it up (its been below 30 degrees here lately). It was acting like maybe the choke was sticking but it would come out of it when you got moving. A couple days later it did the same thing but it did not stop while driving. The next day it was worse, then it died and would not restart.
I smelled gas so i thought the choke was stuck. Turned out it had a cracked fuel hose. I changed the hose but the truck wouldn't start back up or fire at all really. Pulled the number one plug and it didn't have a good spark, also it was pretty black (carbon or suit i think, not oil). I have since changed the ignition module, cap, rotor, coil, and still no good spark (seemed yellow and possibly intermittent but its hard to tell without working alone).
I'm not sure what to do next. Could it really be that all the plugs are so bad that the thing won't start? Is the distributor bad maybe? It will kind of give a little sputter if you crank it over and over but no real firing. It was running great til the other day. The distributor hasn't been moved so the timing should be good. Any suggestions are welcome and any help is greatly appreciated. I need to get this thing back on the road. Thanks