I bought one of these 3/8" palm ratchets off the Snap-On truck back in the late 70's or early 80's. It was just the right "tool for the job" ... which was header bolts and/or spark plugs on my 351C in a '68 Torino, if I recall. That engine was fairly "shoe-horned" in there.
I also recall heating and flattening out the 7/16" end of a box-end wrench in order to get to ONE header bolt snugged up. It was *just* the right length that you could get some good torque on it, but short enough to clear the shock tower and get some decent "swing room".
I still have both of these tools, and have found various other uses for them throughout the years.