Looks like we don't have one of these in here yet, so lets start one!! Besides that, recent events are making it look like this may be the route I go. I know that my shop knows all about what to do... but I sure as hell don't. So people, lets assume that you got something with a 4.3L and you just happend to come across a 5.3L with all the accessories, wiring harness, and computer. My questions are:

How do you mate the old and the new? I can't find companies that talk about anything.... harness mods or otherwise.

What needs to be beefed up? New radiator, fuel pump, wha?

Simply does any of you super knowlegable people know anything about this? I may not be doing the work but I would still like to know about it. Might help me realize the cost of all of this.

Oh and as always... thanks for tollerating the n00b questions!

Mike