Brendon,
I'm not sure about trucks of that age, but I know for the 60-66 series, the 3/4 ton "always" had a parking brake on the drive shaft -- but there were exceptions based upon the trans type (if I recall).
In other words, I don't think the presence or absence of a particular type of handbrake is a good indicator. Things like Bill mentioned are much more definitive, IMHO.
Brian
Brian
