1. Are your spark plug wires correctly installed in the correct firing order. Does the coil & condenser check out good?
2. Was the distributor removed and properly installed? - could be installed 180 degree out of time.
3. Proper distributor timing setting??
4. Tilt cylinders probably need to be repacked
5. This A-C truck is older than dirt - well over 52 years old - I joined AC in 1967 & that model had been replaced by the F40-24 & the engine was an 4G153. Probably why no one has hear of it. You will have to get creative to try to keep this "antique" running. Your best bet is to get what you can for it at the scrap yard and invest in a newer model. Not many old time former A-C dealers left on the West Coast to help you - the Komatsu dealer in Oakland might help you and possibly Cal Lift in the City of Commerce. After that you are SOL