Hy Smangy, welcome, that trucks serial number probably begins with a W (denoting a tandem) if you could post the serial number I could probably decipher it for you. That size of truck in 1958/59 only had one engine option the Chevrolet 348 V8, the truck had a GVW 0f 36,000 Lbs., and was available in three different wheelbases. Hope that helps some.
