Starter not engaging
B&M 10230 is for 727 trans. I have used them in the past never seen them used on a 904.
B&M 10230
Fits: 6-Bolt, Mopar, 727, V8
Flexplate, Internal Engine Balance, 2-Piece Rear Main Seal, SFI 29.1, Each
Rear Main Seal Style: 2-piece
Engine Balance: Internal
Flexplate Material: Steel
Safety Rating: SFI 29.1