Grigg,
It will be a 283, I was able to leave the factory crossmember in but this is a newer sm465 with the rear mount and alum bell housing. Its a 2wd.

http://i1062.photobucket.com/albums...7-409D-A15C-585C95F67DDF_zpswoqloxz3.jpg

Last edited by Blind1968; 08/09/2016 9:09 PM.

1949-52 Chevy 3800 1-Ton Flatbed
In the Stovebolt Gallery
More pix on Photobucket