Well i got a 454 with a comp cams Xtream Energy cam. .552  intake, .555 exhaust with a lobe seperation of 110.0. Now i dont know if i need to give more info on the cam but will my engine produce enough vaccume to power the brakes or should i go with a vaccume canister, or save up  little and go with the poker steering booster kit?  

My spelling is horrible.  

that cam with your displacement should be marginal for power brakes.anything under 12 inches of idle vacuum a booster should be used.hope this helps.  

I also have a 454 with a big cam in my '70 chevelle.  It also makes poor vacuum unless I rev the throttle with my right foot and brake with my left.  That gets tricky sometimes though with it being a manual trans and my only having two legs.  I installed a vacuum reserve canister without noticing a change.  I ran a vacuum line from the manifold to the check valve on the canister, then a line from the brass port on the canister to the check valve on the booster.  Is this correct?  Any troubleshooting tips would be appreciated.  Thanks.  

I have the same problem, but it help that my 2004 chevy has a helper vacuum pump and I added the canister but still not enogh specially if pulling anything. Now after expending some money mecanics tell me I need the power stering booster. good luck  

Doing research to find more vac. and ran across this thread. What models did the power steering booster come on and will it work on my 86 Blazer to help pull more vacuum?  

Producing vacuum from the power steering pump? I've never heard of such a thing...

I'm awfully sure nothing like that exists, a "booster" (on brakes or power steering) uses the vacuum the engine produces to get more line pressure. I've heard of systems that use the power steering pump to power the brake systems but never of one producing more vacuum on its own.

This is something I came up with quick...
"Quick, Hit the Hydroboost!" - Super Chevy Magazine