I have converted many carbs back to the "Lower Position" IFRs.
People always seem to have tuning issues with any carb that has the higher IFR position.
Simplest way is to just install a basic 1850 (600 cfm) or 3310 (780 cfm) metering block
on the primary side of the carb.
But it is your carb. In the time when Holley went to the high mount afr position they
were trying to get the carbs to pass emissions in some states who had idle emissions rules.
You also do not need the 3 emulsion holes on each side of the metering block.
Ask yourself, why did Holley go from a 2 hole per side Emulsion strategy, to a 3 hole, then a 4 hole, then a 5 hole emulsion block"
Because they did not understand how the emulsion circuits worked.
Buy a used Primary Metering Block (at a swap meet), 600 cfm #1850 or 780 cfm #3310, and install it on the Primary Side
if you are afraid to mess with modifying the metering block you have.
The engine will be a lot happier with that simple modification.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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