Some disk brake packages change the track width. Most make it wider, although there used to be a couple that were slightly narrower. The wilwood kit that used to narrow it the most is no longer produced though.
Barracudas have a little more room up front for wider tires. Not great for tall tires, but they handle wider tires a little better. And with a good fender roll they’ll fit more. Most of the cars I’ve seen with year one rally’s sit high, that’s how they get around it. Same as jacked up the back and hanging the tires out. The backspace is just not great for the front of a BBP A-body. A 17x8 with a 225 is a waste of time IMHO, no point in that wide of a rim for that narrow of a tire.