Is everything stock? ie, E-body 8 3/4, stock spring locations? Are you planning on running that combination on all 4 corners? And, what diameter is the rim? You say modern so I'm assuming 17x8.5 or 18x8.5? The diameter is important in the front.
In the back, if everything is stock and in the stock locations, yes, that should work. With 275's it will probably be tight to the springs, but you could use a small spacer if necessary.
In the front it will depend on the diameter, because the clearance to the outer tie rod ends will be close. With 18's it will work fine, with 17's I think you'll need at least a 5 to 10mm spacer, the latter of which is the thickest I'd ever want to run for a plain spacer and will require longer wheel studs. If the diameter is less than 17", it won't fit.
Also, depending on the profile, a 8.5" wide rim may not be wide enough to run a 275. I know with my 275/40/17's the narrowest recommended rim is a 17x9".