I'll check it out, Daniel.

We cleaned the fuel system out tonight. Replaced some hoses, put her on an IV drip and shee fired up perfectly, got the fuel pump filled up, removed IV and thew thing starts and runs like a top. Idles perfectly! No knocks. We do have a radiator leak which probably explains why she was parked 15 yrs ago. Will get that pulled and repaired or replaced soon. It goes forward and backward, too! Only 10 feet both ways but it moves! IT'S ALIVE!

Question for you experts: how much "smoke" or vapor is normal from the breather and or oil filler cap? I'm thinking it's moisture from sitting but not sure. We only ran it probably 5-7 minutes so it was warm but not hot.

1956 F600 272
2005 F250 5.4

The rings may be sticking causing some of the blow by.  Fifteen years of sitting would be the cause for that but continued running at temperature will help on that assuming the engine is simply not just well worn.  If it’s moisture causing the blow by, you have bigger problems but if that’s the case, you should see that moisture on the oil dipstick above the oil level line after running the engine.  If no moisture is present, this would be a good time to change the oil if it’s crude oul ‘black’.

Lorena, Texas (South of Waco)