A couple of things.
1. In most areas it is illegal to have amber running lights to the rear. Amber is for front only. I have read about some people dying the amber turn signal lenses to red to make it legal. I never tried it so I do not know if or how well it would work.
2. Always match the color of the LED to the color of the lens. NEVER use a white LED behind a colored lens.
3. I replaced all of my brake running and turn bulbs with the 45 LED towers from SuperBrightLEDs. They are all much brighter than the incandescent and there is excellent contrast between brake and running. They are not cheap, but are worth every penny.
4. I am not sure on the electrical differences in the flasher circuit between your 84 and my 88. on mine if I went with a LED friendly flasher I would also give up the self canceling. I went wit just 2 load resistors, one for left and one for right. everything on the bike works as it should.
5. If You do LED brake/tail light, you will have to jumper the CMU to stop it from always indicating a bulb out.
6. I have my license plate lit with the red light from the LEDs. it is suposed to be white light, but so far after one year I have not been stopped.