1- It's a Barracuda, which has a more restrictive wheel opening than a Dart
2- It's a Barracuda, so it doesn't have the lower fender support to adjust that lower corner
3- The 15x6 in that thread is a 0 offset, the OP's rims are a +19, which means the wheels on that Barracuda stick out almost a 1/4" further than the OP's
4- The 215/70/14 is 25.9" tall, which is still taller than the 245/45/17 in question
Always true, body tolerances on these cars can change things by more than a 1/4". But an alignment and possibly some adjustment of the lower fender to bumper brace should clear those wheels
