No problem, the ID number FF 353 decifers to "FF"= '47-'50 COE, "35"= 350 series 2 ton, "3" = 161"in. wheelbase. Should have a 248ci. engine. Feel free to contact me with any future questions. I've owned close to 30 of these trucks through the years. Click into the links below to see some of them. Check out the website,
www.oldgmctrucks.com Join the discussion forum there also.