Need help with 2 issues but same place!

With a 440, there are no street tires that, without help, will ever hook.
Once the springs are out of the way, the tubs are the next interference. But you only need to move the springs over about 3/4 inch.
After that, 255s fit in there just fine, but 275s, to stay in the tubs, will need the exact right offset custom wheels. And if you really want them to hook,they need to be tall tires like 275/60-15s. And to hook those as best as you can you are gonna need to spend some more coin. Or maybe, you just need to modify your launch technique,lol. To use a 15x10 wheel with a common 4.5backspace, the rearend will have to be narrowed. Yeah you can put 275s on an 8" wheel, but then you might as well stick with 255s. 275s like a 9" or better.If the wheel is too narrow, for reasonable treadlife, you will need to run the tire pressure too low for street use.