I did an 8.1/4l80 and its been a lot of fun. Biggest recommendation would be the plug and play harness howell engineering makes for it. (It even has cruise wires labeled and ready) And the EFI tank with pump so fuel pressure is set. getting around 15/16 if I stay out of it... But the norm...
Did it....Love it.....Just took my first 8.1L for a long distance road trip. A few tips to follow....
search "dirty larry" like that one guy said
had original harness rebuilt but I still decided to do correct new harness from Howell Engineering.
Find a blown up 8.1 from possibly a van. That...