Wade, that engine casting number 3887004 doesn't come back to an engine block. Is that number on the side of the block down near the oil pan or possibly on the head?
The truck itself is a 1953, since it has the split windshield. A 1954 or later truck would have a one-piece windshield, and the grille would be much different. Peggy's link will help with that. [on edit] Actually
THIS will help identify the year.
Also, the serial number plate on the driver's door hinge panel should nail down the year of the cab (if the plate is original.) The
1953 Vehicle Infomation Kit has serial number info (look at pages 8 and 10)'
[on edit]Looks like Dan got things nailed down as far as the engine identification.
You need to be sure which flywheel/starter combination you have (see
HERE, although the clutch should be common to earlier and later trucks. You just need to determine whether you have a 9-inch or 11-inch clutch. The flywheels are different for the two clutch diameters. A 9-inch clutch will have 6 bolts holding the pressure plate on, while the less common (and hard to find) 11-inch clutch has 9 bolts.
