Width disc brake swaps add??

[Josue]

Might be a vague question, with all the different routes and manufacturers you can use for disc brake swaps, but how much will disc brakes push your wheels further out vs. drums? I know the rotor hats are a bit thicker than where the drums slide over the axles/hubs....

Specifically, I'd like to do a C5 swap on the front of my '68 Firebird, and either LS1 or C5's on the back, still need to research the difference between the two. Does anyone have any first hand knowledge with these on 1st gen F-bodies? I just bought a used set of wheels, and I'm trying to figure out the suspension setup I want/need so my tires aren't buried into the body or something! I keep forgetting that the disc brake swap is something I need to take into consideration with wheel placement too. Getting the wheels first like this, is forcing me to do things a little backwards, but I'm sure someone out there has been through this before...

Thanks!!