See my post over at slantsix.org. Basically I recommend contacting a converter manufacturer, and letting them do the math. Your engine has the small pilot, and the trans has the small spline input shaft. Not too many converter builders will build those any more. Edge racing converters made my last one (they have also made a small pilot/big spline converter for me). I suggest contacting them. https://edgeracingconverters.com/