1984 GMC C7000 366

I have a truck that has been sitting since 2010. It is not running. It turns over, It was not getting gas, I replaced the fuel pump and now am feeding it from a gas can. It is now getting gas

I don't think it was getting spark, I replaced the distributor cap, rotor and coil. still nothing. there are 4 wires into the distributor cap, a red, yellow and two plugs. I guess red is 12 volts, yellow is grounded through the ignition switch???

The plugs are Autolite 144s, they are carbon coated...

1984 GMC C7000 366

1984 GMC C7000 366