The '84 wiring harness is way too much work unless you know what each wire went to. Hours and hours of tracing to sort it out. Most aftermarket harnesses are labeled on the wire every few inches which makes them more user friendly. As for pricing, go with whats comfortable with your budget. There are differences in quality.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)