Need Help figuring out what bell housing to get

I needed one myself , I found it on ebay , and just purchased a few days back , #3743859 is the one you need for O.D. Tranny ,,mine is going in my duster ,,unsure how an O.D. will perform but its been rebuilt so I hope it good for a street driver 340 , also the O.D. Tranny on mine takes the 26 spline on output shaft for drive shaft yoke instead of the 29/30 SPLINE