I run 275/40/17 all around, so you tires sizes will fit easily (I have lots of extra room).
On the rear, I have a 17*9.5 rim with 5.5" BS... Pretty sure anywhere from 5.0" to 6.0"+ will fit... I currently have drums but am considering rear discs, so I got extra BS (rotors are a little thicker than drums and I might need a spacer to clear the calipers...)... If I was staying with the drums, I'd consider 5.0"- 5.25" BS (of course, I'd double check before ordering)...
For the front, I can't say, because I have C5 Corvette brakes on factory "drum" hubs... Not sure how much these will differ from factory...
I did temporarily run these rims with "factory" front discs (1969-1972 A-body discs), and they were okay, but I didn't check to see how much extra clearance I had... I have Hotchkis 1" drop springs... My fronts are 17*9.5 with 6.0" BS... I wanted to be sure to clear the outer fender, and still there is plenty of clearance on the inside...
Mine aren't TTII, but BS shouldn't matter much...