Many good examples out there. For a 400 ci, pick something with duration around 220 and LSA spread out on 112 or more. The 068 is just one that comes to mind, made specifically by GM for RA 400's and it's much larger than the Eddy cam you currently have, yet will idle nicely.
With that being said, Idle quality is going to be directly related to where you install the camshaft ICL as well as your timing and carb tuning abilities.
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