For a 74 Charger SE. Currently I have a set of 17s. They look okay, but honestly I think 17s are the largest rims possible before entering a territory I'm not too fond of. I'd rather have some 15s. But I also like the old school, raked, "jacked up with fat tires in the rear" look. So I was thinking about putting some Mickey's on there ---> https://www.mickeythompsontires.com/drag-tires/et-street-s-s I was thinking maybe either the 275/60 or the 295/55 for the rear. In any event, I know I need to do some measurin and figurin... What do I need to measure on the car, as far as "backspace", wheel well size, etc? What do I need to know about "offset", and how do I determine correct rim width (15x8, 15x10, etc)? I know I need a bunch of measurements, just not sure exactly what needs to be measured. Also, what effect does tire/rim size have on torque, rear end gear ratios, etc? What I mean is, what do I need to keep in mind about how the wheels effect the driveability, take-off, get-up-and-go, fuel economy, etc so I don't wind up fighting against myself once I start working on the motor/drivetrain? Car currently has a 318 but I have a feeling I'm going to wind up doing a stroke on it (or having a stroke in the process, hopefully not).