Performance timing
My truck has power brakes
Depending on the booster, not all of them will work properly with the 292 cam's very low idle-vacuum. On my combo I always drove it into my parking stall .Later, by the time the engine was warmed up, and I had blipped the throttle a few times, she had enough vacuum to work my brakes. And with a manual trans, I am always blipping and speed matching on the slow-down, so the booster is always charged. I used a booster off a mid-70s F-car.... I think. That or a 73 Dart. For my combo, it always worked.
It's been said that the 292 with an automatic, will not keep itself charged all the time. I guess you will know soon enough.
I can tell you for sure that the Dual diaphragm booster did not work for me. I even went so far as to take it apart and see if I could mod it, but no dice. Cuz I really liked it's small compact size and original look. Now it sits on the shelf with all it's also-ran brethren.
