Why an S-10 ?

[Jack Guzman]

I noticed that alot of people here have 1950s era trucks mounted on S-10 frames. I don't understand this. Unless your original frame is rotted what is better about an S-10?
That issue aside, Is the S-10 frame that close that it fits easily? I drove an S-10 once that had a 350 motor and a gm 350 turbo transmission. Making everything fit must have been an interesting project.
Anyone care to enlighten me on this subject? Thanks---Jack