Does a 2wd '53 Chevy truck have IFS? I would think it does, but if so, why do soo many people graft on a later-model sub frame?

Also, are the trans. in these syncronized? I think not, but i'm not sure?

I ask because I know of one for sale, but want to learn more about them before I check it out. I'm new to 50's era cars.