I think that you will need a new tune with that intake manifold.
Individual air to cylinder passage are different by stock manifold.
Edelbrock must flow much more air than stock and the individual cylinder trims are off the chart.
Mode 4 control allows you to control realtime how the engine runs.
You can force open loop while the engine is running or change spark advance.
I advice you to start playing by that and see if the lean conditions exhibits only at closed loop.
Hint. Warm the engine, switch to open loop and lower the afr value, while monitoring 02s.
You might post your current bin too.
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