Anyone install three speed with overdrive behind a slant six

Its a A833 4 speed overdrive has three levers excuse my ignorance years ago we called them three speed with over drives. If anyone knows all the particulars I would appreciate there responses. I will need a shifter which one works the best stock a body four speed? Can I use the stock three speed bell housing. Just trying to come up with a parts list. Thanks in advance first slant six car that I have not converted to V8. I want to stay with the slant six just do not want to waste time looking for the wrong parts.

Your bell housing should have a dual pattern for 4 speed and 3 speed. The shifter is a standard A body Hurst with the O/D lever pointed down and a special O/D 3/4 rod. You would want an O/D with the small front bearing retainer to fit in an early bellhousing. Check your output shaft spline and get the O/D with matching output splines. I think your drive shaft will work.