in the process of doing motor swap - need help

[iRATESiNCE88]

i have on 02 yukon 4x4 5.3l i blew the motor twice running too much boost on my magna charger. ya, i knew what was going to happen. Anyways, we have the motor pulled and i am current looking for a 6.0 or something to drop into it while keeping the magna charger and running a little less boost. having a hard time finding a decent motor to drop in it. most have really high mileage from what I've ran across. if anyone can give me a little guidance please let me know. thank you