GM didn't put the VIN numbers on the motors of the trucks until the early-mid 70's.
So the block contained a simple stamping that indicates the motor size, the transmission type, the vehicle type/size (ie: 1/2 ton, 3/4 ton) and where and when the motor was built.
However, you will not find the VIN number on that block.
The GM cars were different....the block stamping including part of the VIN.
The trucks transmission will have a similar identifier on it.
All of that said, 'matching numbers' is not really possible with these trucks...but you can do enough math on the motor to know the motor is probably original.
As a result the same level of value relative to a car's originality does not really make it into the trucks at the same level.
In other words you won't get too much of a value premium for an original motor/trans truck vs. a high quality upgrade or replacement drivetrain.
My two bits.
Coley
