[PeteKz]

In addition to Mark's and Kelly's comments, when you put fresh fuel in the tank, add a bottle of Chevron Techron Concentrate, or similar fuel system cleaner. You already changed the oil right? Save the old filter and cut it open to see if any metal is inside. There's a reason it was parked in a barn for years--it might have engine problems. Definitely replace all the rubber fuel lines, but the black plastic fuel injector lines on the engine should be okay.

If no metal in the filter, then remove the spark plugs and unplug the CDI. Crank the engine until you get oil pressure for 5 seconds or more. Then reconnect the CDI and check for spark. Then reinstall the spark plugs.

At this point, you can try to start it. It will probably take a squirt of starting spray to get it going.

Once you get it running, drive it! That will not only keep you motivated, it will circulate the fresh fuel and cleaner, and as you exercise the engine it will gradually run better. You will also find out what else needs work, such as: transmission shifter bushings, pedal cluster bushings, clutch adjustment, steering wheel bearings, alignment, suspension, etc.

I look forward to seeing your progress. It will be a fun father-son project. As Shane said, it's good to have adult supervision!