3837004 is a 55-57 235.
The part that the setscrew is mounted to, and is held onto the block by headless bolts THAT YOU AREN'T SUPPOSED TO REMOVE, isn't part of the oil pump. It isn't supposed to be removed because it is machined WITH the block, not separately. By removing it, you run the risk of screwing up the alignment between the oil pump and dizzy, with the possiblity of breaking the dizzy shaft, or trashing the gears.
Didn't know that. After some new block machining it was reinstalled and all is well.
