Vacuum reservoir for power brakes

Idle is set at to 800 rpm in park. The cam was a MRL pick... which in hindsight, I would have picked a different engine builder. With my kids college coming up in the fall and a car driven about 500 miles in the summer. I will have to live with it for a few years.

Would a different intake manifold be better? Recommendations? I really don't care for the chinese knock air-gap that MRL put on it.