I don't mean to thread jack your post but I've got a question! 1970duster I am putting together a 72 swinger I just picked up its a factory power front disc brake car and the thought of rear disc interests me greatly the previous owner had already swaped in a 8.25 so that's not a problem my question though is when you do the rear disc swap do you have to run a adjustable prop valve for the rear????? Sorry again OP I had to ask!
