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They're just HD springs with an extra inch lift. Also I used the US car Tool kit for the spring relocation and am using the middle mounting hole for the front spring mount.
Check your vacuum when driving in high gear on a flat stretch. Then choose your PV.
And yes, install smaller idle restrictors! Your IAB is good. Also don't worry too much about squaring the transfer slot on the secondaries.
Small update. I pulled the intake off again and this time it was very well sealed. No signs of oil leaking into the intake ports. Just waiting on gaskets and my buddies leakdown tester.
Next is pulling the valve covers to make sure the valve seals are in their proper position.
I re-read your initial post and am wondering if you have a wideband o2? Also do you have pics of the IFR installed and what's the size of the IABs?
I doubt you're pulling fuel from the main circuit unless you can physically see it happen. That circuit shouldn't be active at 1000 rpm.