Choice between 4.8 and 5.3

[1966Stepside]

Ok, so I have a choice of engines to buy. The one I had intended to buy was a '05 4.8. Now I have a choice to buy a '06 5.3. The 4.8 has 17k on it, and the 5.3 has 80k. I also believe the 5.3 has the variable displacement since it is an '06.

So, should I go with the 4.8 with lower miles, but also lower hp and mpg or the 5.3 with more miles and more hp and fuel mileage? I don't intend for this truck to be driven every day, but 2-3 times per week wouldn't be out of the question. Help me decide!!!
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