904 to 727 upgrade.

I've heard a lot of silly talk about "parasitic drag"...Claims that the 904 saves tons of horsepower over a 727; same with a C4 over a C6, and a th350 over a th400. But in every case, either the kd wasn't properly set up after the change, or the original large converter was used.
Duane, isn't the non-lockup input shaft from something beside a slant six compatible to eliminate the lockup feature? I'd love to see a write-up on using an eighties 999 or whatever with the five plate dual bushed direct drum, wider band, and low gear first; with the retrofit non lockup feature. Along with the pump gear conversion to eliminate the converter lugs.