That seat looks good, it really makes a difference when you're not falling out the door around corners huh?
You can use the 700R4 behind a 5.3, just need a cranshaft spacer ($40), the TV kit from Bowtieoverdrives for vortec intakes ($150), and to program the pcm for a manual trans. The benefit of the 700R4 is keeping the factory speedo cable, otherwise you have to use aftermarket guages or modify a 90-up suburban electronic speedo guage set.