I recently purchased what was advertised as a farmall 450. After inspection it is what I believe a combination of a 400 and 450. It has a 400 fast hitch, steering wheel, it starts with a key, and the serial number is 35423 but it also has 450 PPBE 64. The casting codes for the ta housing and the rear axles are 3-3-B to 3-13-B, but the block,rear end, hyd. tank, gas tank support, and front end are all around 11-3-B. Also on the block it has C-281. It has all the original emblems 450 and McCormick and the McCormicks have the white paint in the background. This also has factory power steering, and a tach drive distributor, with a tach. I am looking for some more information about what it is that I have. Thanks for the help.