O2 sensors on domestics didn’t really come along until 1981 but some European cars used things like that starting in the mid 70s.
I agree with texases about finding something older than 72. Around that time is where engines (due to government mandates) had to resort to more complicated carburetion, various solenoids and thermovalves, along with a country mile of vacuum hose in an attempt to conform.
Some of those older trucks are pretty desireable and prices reflect that desireability; at least for one in half decent shape.
The main thing I would advise you to look out for on an older vehicle is rust. Mechanical repairs can be picked at here and there but major rust can make you wonder why you even bothered.