stuck valve???

Just picked up a 74 ltd with a 400m. The motor has 63000 miles on it and has not been driven since 1991. The car is going to be my work cruiser. So the problim is a miss at all rpms.

I rebuilt the carb 2150 and it run better still misses. The vacume guage fluctuates 17 to 20 at 750 rpm,with what seems like a weak cylinder. Replaced cap rotor wires and plugs, no change. When I stomp on this sled it runs fine,strong no miss. Whats next ? how do I check for a stuck valve? There is no noise from the lifters. What is making my vacume gauge goofey??

First you say it has a miss at all rpms.
Then you say you stomp on the gas, and there is no miss.
Sounds fine to me LOL!

Wet and dry compression check (or leak down check if you can). Have you narrowed it down to which cylinder is the problem?

If you got NO miss at WOT then you got NO stuck valve.... know what I mean?

Check the carb base plate for warpage and a vacuum leak.

Since it sat for 16 yrs check all the rubber vac lines for cracking and replace them if they are dry n brittle; brake booster, vac regulator, vac advance, PCV, HVAC control and so on.

I yeald to the ford motor head here. I checked the comp and found 2 cylinders bad beside each other. bad head gasket. a quick squirt of oil and no change. the heads are comming off. As long i am in there might as well replace the cam and timming set. what cam dose the fordmasters think this 5000 lb sled will work??