I just went through all of this a few months ago. I heard that vacuum boosters, cannisters, etc., were problematic, and opted against them, and instead converted my car from power to manual brakes. It was easy and I love it, all the difference in the world. The cam for my 440 is .545 lift and 297 duration, and I swear it was operating on 1% of brake power with power brakes. With manual brakes, they are like a rock. Benefits of switching from power to manual brakes are:
I can actually feel the road.
It's marginally lighter weight.
It's mechanically simpler (therefore better in my book).
I have absolutely ZERO worry about brakes due to a big cam.
I'd say there are no drawbacks. Some people think that manual brakes take more effort for braking, but I don't think so, it's pretty close.
What I did:
I got a complete Baer Sport Brake system (expensive, but excellent quality, and fairly easy to install)
Got a manual brake pushrod
Mounted the new master cylinder directly on the firewall
That's about it. 100% solution that is 100% better. Just my 2 cents.