I disagree. There are so many aftermarket kits these days that include high pressure fuel pumps and complete conversion harnesses that it would not take as much effort as one would imagine if you are mechanically inclined.
Building a SBC to the same power as a stock 5.3 would never be as cheap as just buying a 5.3/4l60E take out with harness and ECM.
Hell, you can find 6.0 completed packages for around $2K if you shop smart and that is WITH an accessory drive.
**** man you disagree with everything i say. but thats ok because you own like 20 or so
screwdrivers or something