Sorry it took so long for a response.
I'm going to install a 6.0l LS2 I got out of a Chevy Express 2500 van. My cousin's company just purchased new vehicles so I got the entire van for cheap. Right now I'm collecting everything needed and will start rebuilding/stroking the motor soon. I'm also going to upgrade the tranny, originally I was going to use a 4L60E but the van has a 4L80E HD which is a little stronger. I have to tear it down to install the new output shaft so I figured that it might as well get some attention. My hope is to have it completed by next spring but we'll see how that goes!