You can get the harness done however you want it, with or without emissions. The harness & ecm from an
F-body is pretty much a stand alone system. As far as the diagnostic port goes, you'll have to tie it into your new harness (I have not done this yet) or it will still be connected to your old ecm and it will not be functional. I wouldn't say this swap was easy but it's really not as hard as it sounds, but yes a 383 stroker would be quite a bit easier but definitely not as coool