Sounds like you're nearing the finish line!
If you have a signal generator and scope, you can do a bench test of the crystal. In my CTC-4 article, scroll to the section titled, "Bench Testing the 3.58-MHz Crystals":
http://antiqueradio.org/RCACTC-4ColorTelevision.htm
Thanks to dtvmcdonald for that tip.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html