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OK, other than a possible VIN number, I'm not sure what that number is from on the Engine Pad that you posted a picture of, but what I need is the Letters and Numbers stamped next to it that can be partially seen in the picture.
 

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By the way, we would need a Date Code to be sure, but so far it looks like you have a non-original Truck Engine in your Impala. Let us have a complete picture of the pad when you get a chance.

This would also make sense why the other number on it is not corresponding to anything.
 

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Would it be a crate
I don't believe so. Proof would also be that other number on the Engine Pad. What that is, is a partial VIN of the truck the engine came out of. That's why it wasn't making any sense to us.
 

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how'd you figure that out, Bill?
Although I have many Books, there are 5 or 6 different good sites online that list Engine Suffix Codes. Some are Big Block and Small Block, some are just Small Block. Below is a sample of one of them. This is also the site where I found his TYX Code. Also Starting in 1970, they went from sometimes just 1 and mostly 2 Letters, to 3 Letters. The earlier 3 Letter Codes will start with "C", the other "T". C stands for Car, T for Truck. That's how I knew he had a Truck Engine before he listed the complete Code. Always go by the Last 1 to 3 Letters of a Code when researching.

 
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Although I have many Books, there are 5 or 6 different good sites online that list Engine Suffix Codes. Some are Big Block and Small Block, some are just Small Block. Below is a sample of one of them. This is also the site where I found his TYX Code. Also Starting in 1970, they went from sometimes just 1 and mostly 2 Letters, to 3 Letters. The earlier 3 Letter Codes will start with "C", the other "T". C stands for Car, T for Truck. That's how I knew he had a Truck Engine before he listed the complete Code. Always go by the Last 1 to 3 Letters of a Code when researching.

did not know that. mortec.com also had nothing on this either and they're usually pretty complete

googling for TYX and specifying mortec got this result
 

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Would it be fair to say off a c10
Most sites are saying C10 - C30 but it really doesn't seem to matter. It looks like the same exact engine as a passenger car, showing the same horse power, etc. It is also showing a 4-Barrel Carb as well as Auto Trans. It just so happens to originally be from a truck. Most sites are saying a '75. A couple of sites are saying possibly a '76 or '77. A Date Code would prove that though. Which is on the back of the Block but can be hard to see with the engine in the car. If you feel the Intake is original, a Date Code is also located on there.
 

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do you mean "make a harness"? or substitute for the harness?

can you ? probably. would I? I would not. what is the problem you are attempting to resolve?
Thanks for reply my 66 sat for 20 last year I started with wires no pro but every instrument works I recently got rid of my 2013 suburban why I took all the wire out don't know so I looked at wires and they are are the same maybe a gauge or two off there complete I just wanted to make the harness smaller lighter and thought about making a harness out of the 12 feet of wire from suburban the gauge of wire got me stumped so was wondering if I made every wire the same would I be alright thanks again
 
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