double sided tape is best. if you take your badges off, and still retain the tape on the badge, use thin refix tape over the existing double sided tape... this is as long as the badge comes off clean with no chunks missing out the tape.
you have a good chassis to build to mate. welcome, look around and get the car to how you want it. anything you replace you can always sell on . not many reds around. the car used to be plated 2 sxy.