58 dodge d100 315 poly

The transmission that will bolt up is most likely the 2 speed Powerflite. It is a heavy, cast iron case unit. The cast iron 3 speed TF will also likely bolt up.

The crank flange should have drilled holes, not threaded like later cranks. The TC that fits these has 6 or 8 studs that stick out the back of the TC, & the TC bolts to the crank using 3/8" UNF nuts. There is a short, removable coupling that connects the TC to the trans pump.

I would imagine these parts will be hard to get. Better option would be to see if a 1962 or later 318 crank fits, & then you can use the 727 or 904 TF trans.