Thanks for the advice. Let me know how the new pump works. My wife will be driving the truck so I think I will need the power assist.Yes, you could, but try out the storage tank on an average 3 block drive and see how much vacuum is left and how fast the vacuum pump replenishes it.
The larger the tank, the slower the refill before the next brake application.
I used a 2 gal tank and pulled a good vac on it and then drove around town a bit to see how long it assisted the brakes.
Not long so you need a good CFM pump to keep vac as needed.
My car is lighter than when original so the power assist is really not needed.
Working on a bigger bore pump now.