Is this getting old

[GSD]

Sorry for the re-post

In the process of buying a 80 chevy sb 4x4. Overall pretty nice truck
except for one thing kinda buged me. The truck has a 5.7 and when I drove it it didnt seem to have the get up and go that you would think it should have. From a dead stop if you were to stomp on it the rear tires will barely screech. The od says 69,000 and they say its true miles but im doubting it and thinking its 169,000. Is there anything I can look for performance wise to make sure this is not just a old tired engine? I have had 5 of these trucks over the years and they all seem to run alot better.


Thanks
Jason