On my '50 COE, the air cleaner is mounted next to the battery box, under the passenger seat. There is a long tube that sweeps forward and to the driver's side that attaches to the carb. This is not the best place in terms of drawing in relatively clean air.

http://s1116.photobucket.com/user/1950Cabover/media/IMG_0906_zps9728252e.jpg.html?sort=3&o=7

This link show a photo of the air cleaner from behind. The air cleaner is against the inside of the right frame rail and is tucked in just to the right of the transmission.

Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix