Anyone running a 904 behind a 340?

A&A transmission makes the internal spring kit that you need to replace the factory reverse wound spring. I like working with John cope with cope racing Transmissions that's why I bought the parts from him rather than from a&a that seems to be operated by a butthead.
I called them, was gonna spend some cash... they just acted like they didn't have time for me, or my questions. Was told to call back for John. He didn't have time either