ID bellhousings with a casting number????

3893728 - small block aluminum bellhousing to 318-360 1969-80 Dodge trucks with NP435 transmission, 5.125" bearing retainer diameter, use with 143 tooth flywheel.

4338364 - small block aluminum bellhousing mid-late 80's Dodge Truck 3.9L NP535 5-spd w/hydraulic throwout bearing.

Not sure either will work with a833 4-speed trans unless the 728 has a possible dual bolt pattern. Sorry this is all I could find...