Whats the number of the carb you are rebuilding?
I always take into account the original factory documentation when finding conflicting or variable real world experience postings on the internet. What works for Joe in frozen Canada might not work of Mike in the desert of Arizona.
Look on-line for a copy of the Delco Carburetor Service Manual - I know there are a few versions out there but look for the oldest dated one so you don't have tones of pages for the electronic versions after 81. My original paper copy is titled:
Carburetor models 4M, 4MC, 4MV Service Manual and it is numbered in the top right corner as 9D-5 May 1973-supersedes 9D-5 dated Nov 1968.
Here is a link to a PDF copy of this manual: http://www.tocmp.com/manuals/Carbs/Rochester/QJet/1973/pdf/1973%20manual%20complete.pdf
or look for the smaller sized particular Delco - Rochester service manual for the make and model vehicle that carb came off.http://carburetor-manual.com/-c-5_6.html
is a good at cost - cheap - site if you go that route.
In any event any of these manuals will have the specs for all makes and models they were original equipment on.
My 69 is currently wearing the service replacement 7029207 MT Q-Jet which is specked for all 1969 L48's including Corvette so I have always suspected that the carb was tuned for the higher end vette and not the lower end Impalas when it became a universal service replacement carb. The part number is the original for the 69 vette. I just found my original Q-Jet and will start rebuilding it this summer.