Cool, looks like a good driver that just needs a little tinkering. I would suggest a pair of stainless steel tailgate straps, there are a few different options out there, the cables on those are weaker/worse than -400 ones.
8.1s are awesome, just plan on checking the oil, they sip on it consistently. Delco Platinum plugs, anything else and you'll probably chase little runnability issues. There is a known issue with crank sensors on them, they just fail over time...aftermarket ones are a waste, genuine GM P/N: 12575172. If it ever needs a cam sensor...
You may be in for a little bigger job, it'll require a timing cover and cam sprocket to convert to the newer style cam sensor. The early 8.1 style has been discontinued but you're in a changeover period for the design and the 02/03 sensor is still available. There's some info here:
http://www.raylarengineering.com/vortec8100-camshaft-position-sensor-camshaft-gears.html