Ron: Why do you insist on trying to duplicate your Holley 850 tune in the Proform carb? They have different venturi sizes (1.56 vs 1.45), different boosters (std downleg vs stepped), very likely different PVCR sizes, different metering blocks... NOT the same in many key aspects.
Not the proper way in my eyes either..........
Here's what I'd do for better baseline to try it without modifying someone else's carb:
- Temp in 80s or 90s, use 78/86 jets; temp in 60s or 70s, use 80/88
- Change emulsion to #1 & #3 open (supposed to be pre-drilled .028", but they're not always drilled consistently), #2 & #4 plugged
- Leave the standard .055" PVCR in the primary, run a 4.5 PV, block the secondary
- Use .035" IFRs and leave them in the raised position since it's not your carb to modify
- Use .035" squirter nozzles primary & secondary
Although the Proform is a smaller carb in pure airflow potential than your current 850 ('cuz of the different venturi size), it could show gains in both the 60-ft and 1/4 ET & MPH because it's more responsive AND has better shift recovery than the 850. But you'll only know by testing...