Sounds to me like it wants more gear,and the single plane intake to work well with the rest of the goods you got.
And possibly more convertor,but I'd hold off on that for now.
The smaller tire upped the effective gear ratio,in all gears.
This in turn effects how the convertor is going to act as well.
And some combos that dont spend as much time in the lower rpm range may not see much benefit with the RPM like it may with a single plane.
I cant say I'm suprised the changes made had a negative affect on that combo,quite the opposite,the 400 is often going to use a bit more RPM to get the power needed to run good numbers,it's not a 455 after all now is it,why try to make it one...
The factory 400 HI-PO cars all came with at least 3.90 gears,the really nasty ones had 4.30's in them!
My advice would be to try the ICL advanced to the 101-102 neighborhood,and try the combo with the tommahawk intake on it with a 1" spacer (seeing as how it closely rivals the RPM in many respects),and consider some more gear out back or a low gearset for the trans to get the car moving out of the hole better with the "bigger" tires,then see how the convertor is getting along with things at that point.
And further head porting would have a big effect naturally as well.
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