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