The easiest way to see if you have a bad valve is to take a small ( I use a dollar bill) piece of paper and hold it in front of the exhaust pipe. It should blow away at a steady rate, if there is a bad valve, it will flip back on the dead cylinder.
The ticking could be an exhaust leak, you have a problem getting rpm and this truck sat for years. Mufflers have internal baffles and over time they can and do, rust. If a baffle has broken loose it will block the exhaust flow, restricting the motors ability to breathe. It's also possible you have a plugged catalytic converter. Since you replaced the fuel pump, and I assume the fuel filter, then low rpm and lack of power takes you to the exhaust side of the motor.
The 351 is a good motor and you just drove it 1400 miles, I doubt something has gone bad in there.
