If you haven't pulled the manifold yet, hook up a vacuum gauge and see if it is on the 20" side or closer to 0. If you give it a squirt of ether will it fire ?
As long as you are grasping at straws - Before I looked up the codes I thought that maybe you disturbed the crankshaft position sensor when you were changing the heater hoses.
It is something simple. I struggled with my H Farmall for days because it wouldn't start. I went through the entire ignition system only to find that the wire on the ignition switch was loose. It was close enough to make a spark but not tight enough to fire a cylinder.
Greg
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