17x8 with a 5.25" backspace is a +19 offset. If you want to run the same rims all the way around that's pretty much where you need to be. You can get away with 5" of backspace all the way around, but you'll be tight on the fenders up front. Like the same room I have with my 275's and I modified my lower front corner. So 5.25" is really closer to where you want to be. In the back you might need a small spacer, it will depend on your car. But with an 8 3/4 and BBP axles it should be the minimum clearance to the springs. I have 6" from the springs to the wheel mount on my Dart with the stock spring locations, so, 5.25" is backspace, another 1/2" in tire, an you've still got about a 1/4" to the spring. Little tight, but it'll depend on your section width, most 245/45/17's are around 9.6" so you'd only have a 1/4" or so hanging over the rim.
Here's your rim, same design I run on my Challenger. Not sure you'll find a steel rim in that kind of offset....
View attachment 1715055119
https://www.summitracing.com/parts/vsw-141h7865gm19/overview/
