Thanks for the help Number Dummy. I purchased a parts manual on CD and I'm realizing how many parts differ from the 254 to the 239 in 53'. Luckily it turns out that my uncle has a running 53' f600 with the 239 flatty and hes just down the road. Any suggestions on where I can find some of these hard to find big truck parts? I will try to call JobLot Auto soon to see what they have. I need an oil pan, clutch housing, front mount and the frame cross member to go with it, and many more.