nice score on the motor, trans and frame, makes up for a rough body
pontiac in a chevy? it's your project, stock to full custom, we like them all
19,000 original miles on 62 yr old truck is probably correct
while we like to think they made them better back then... they didn't
a motor always leaked oil/coolant. they burned oil @ 15k to 20k miles and they were shot @ 24k miles
the body started rusting @ 5000 and you can see what they looked like at 19k at least in the rust belt
can you imagine a 100k drive train warranty back then?
most new motors will go 300k without any trouble as the new 5 and 6 speed aod does all the work
the trans might not last but most go 150k without trouble too
when i worked i put 40k/yr on my truck, my last truck had 204k on it when i traded it
good luck on the build