I just swapped in a FJ80 brake master cyl. and booster into my '79 FJ40 which has the stock front disc and rear drum brakes, but I'm not sure which proportioning valve do I need for this setup. I bought my truck as a project and all the brake components were either missing or rusted to death, and I got the FJ80 (non ABS type) for free so thats what I'm gonna use. I have searched the forum and I got mixed answers and all of the similar cases uses 4 wheel discs. Do I use a FJ80 valve? or perhaps FJ60? .