If im reading this right, you are turning the key and nothing is happening, correct? But if you jump the start solenoid, the starter turns over. You might just need a new ignition switch (the one in the column actuated by the rod from the key). That might be bad and not sending power to the solenoid. Also, if the ign. switch is bad it might not be sending power to the fuel solenoid on the IP. It was bad on my truck when I resurrected it from a 9 year slumber, much like what you are doing.