I purchased a 1973 Cobra Jet Mustang convertible, and the rear end seems to be riding too low. It's been "restored", but I've found a few things that weren't done right, and I'm thinking that the rear springs are original and sagging. I don't want to waste money buying "original height" springs if the rear height is correct but just too low for my liking. I'm an old school guy who likes my muscle cars up a little in the back. Can anyone tell me the correct rear bumper height on a 73 Mustang ragtop? Also, what are the thoughts about replacing the springs versus just adding a leaf to boost the back end? Thanks in advance for any help and advice!