non power MC for disc drum

[donthekawguy]

My truck is at the shop for brake lines, steering shaft shortening and final check before I start driving it. I put on front disc brakes from a 85. I picked up a MC and booster for a 70-72 Impala. I got thinking the other day that my cam might be too big to have power brakes. I will have the brake guy check the vacuum in the morning when I swing by after work. If it isn't making enough vacuum, what MC should I use? I need a two pot manual disc/drum MC. I will keep the Impala set up for when I do a motor swap next year.