Great info here--My427stang, ScotiaFE.
Certainly, I did not mean to imply that there is a lack of experience on the part of the "number-crunchers". Clearly, My427stang has a broad spectrum of experience with these numbers, which is precisely what I find very helpful. Your friend with the Super T10 sounds like he is pushing the engine past its optimum powerband with the over-aggressive gearing.
ScotiaFE, your experiences also have helped revive my enthusiasm for the toploader conversion. A manual transmission is the icing on the cake, the cherry on the sundae, etc. There is nothing like a "big car" with a stick shift. My wagon with a toploader was a curiosity to many.
Thank you for the great information and experience--my Galaxie and FE education continues....