Inliners International Forums General Discussion Engines Everyone who's running a 500 cfm Edelbrock....????

You have a stock cam, so I would think your vacuum @ idle is about 18 inches or so ?
So I would think even the stiffest springs would not cause it to run rich.
Changing the metering rods is the easyist to do.

If you really want to dial it in,, you could buy a wide band O2 reader.
I use the Innovate LM1 works great.cost 300-350 range.