hey guys, ...got a converter that I'm having a hard time identifying, Came with a 700r4 I got..( tho, not bolted in trans)...identifying marks are stamped on. There is D7 stamped around complete circumference and O B 16 D STAMPED IN ONE AREA. It is 12" dia. Now it gets tricky...the input is not completely splined. Every 9 splines there is a gap where there is nothing. I have called numerous converter places..( Reman, Bulkparts etc), and no one has a clue. Thinking this may be something other than a sbc set up or some type of off brand. Any clues?