No brakes on my 440

The best wayto tell if you can get the vacuum high enough is to do a compression test and see what you have. That cam "should" be ok and have more vacuum, but if the engine wasnt blueprinted or the cam is ground way off (normal for MP these days) or the cam wasnt installed right, you won't be able to get what you need. You'd do better at that point to just lose the booster and go with manual brakes...