How many miles are too many on a used engine?

demon34071

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I am looking at (2) difference 2005 Gen 3 Engines with trans drop outs for a project of mine, but they have very different mileage and exhausts on each. I'm wondering which one is the best approach. This is my first GEN3 and I feel a bit in the dark.

1) 2005 GEN 3 Auto trans --- Used engine but was refreshed/rebuilt currently with 0 miles, transmission was rebuilt 0 miles, all basic back to stock, stock exhaust manifolds.

2) 2005 GEN 3 Auto trans --- Used engine with 66,000 miles, used transmission with 66,000 miles, all stock, has long tube headers and cat exhausts included.

Which is the better buy for engine longevity?
 

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