Big block A body spool mount K member?

Now this thread has me curious. I've had my 73 Duster since 2001, it's had a 440 in it since before I bought it. I'm almost certain the motor is in an unmodified K frame. I used the Schumacher replacement spool mounts and not the relocation ones available. Everything lines up in the car and sits level but I've always wondered how it fit if it wasn't modified and I never remember to take pictures.