Kris

I don't think the 106 or the later version 100 lightweights for that matter suffer from the issues you describe especially mid-range and or transition. At least my late version lightweight SS did not and the 106's I have seen run seemed fine. I am aware that some of the earlier engines had issues as you describe.

You are aware that 3W made several changes on the new generation of engines including reversing the cylinder configuration, carb fuel circuiting, intake adapter/spacers and such.