Reverse manual valve body /manual valve body

I got a 67 valiant with a hurst v matic shifter it has a manual valve body Beeing PRN321. If I make it a reverse valve body it will be PRN123 correct? How can I change it for it to be reverse pattern ? Anyone have any links for that process? And since the 67 I have is manual valve body does it have to have a kick down linkage? The previous owner rigged one up . It's a 225 cliff headers and intake with a holley390 cliff 268 cam