The first question is what size Brake drums and backing plates came stock from the factory on a Feb build date, 1970 Hemi Cuda, Dana rear end. Second question, would they be the same as on a track pack equipped 1970 Hemi Cuda or would the brakes have been bigger? Such as 10.5 on normal 70 hemi cuda and 11" on track Pack 70 Hemi Cuda. Please be as exact as you can. I appreciate it. Thank you.