I am not, but I am claiming they used star lock washer on the trans to bell house (at least 70 up), I am also claiming the one 3/8" bolt is longer than the other 3. I also am claiming they where not the same bolts as the Auto transmission.

I did find a post with pictures from some fastener manual for mopars, but it has some conflict and errors too.

I have verified a 70 383 4spd with H bolts also, though I have not validated the length.