Hi Electra 63,
Another suggestion to solve the sloppy steering syndrome would be to go with a more responsive steering box, which made a huge difference in my '63 Riv, and may very well fit your Electra. Go the the Riviera site on this forum and look for Tom Telesco. He will rebuild your steering box with a quick ratio (QR) gearing. This mod really transformed my 63 Riv, essentially converting your box to an 808 QR. Tighter steering feel, better tracking, MUCH more responsive overall. He's very knowledgeable on Rivs and I imagine other big Buicks of the era.