Might be good bones to build from but….you never what’s actually there. Does the converter have provisions for 6 and 8 studs? There’s no reason to plug unused holes in a converter, these trans are commonly used in big hp Cummins builds that wanna retain road driveability since the the th400 is 3 speed and less than desirable for driver use. I could maybe see if it was multi use pattern, 6, 8, and whatever pattern they’d use on a cumstain engine.