So say a guy has 186,000 miles on his 02 Silverado 1500 and is ready to look for a new engine. The current engine in his truck is a 5.3 and he is thinking about movin' on up to a 5.7 or so... Now if I am thinking correctly this would require a total computer and wiring harness switch out also right? How much of a pain in the butt would that be? Should I even contemplate doing it myself, or should i just plan on staying with a crate 5.3? Thanks in advance for any answers yall can give me!