The secret to a good growly Ric...
DR Highbeams or Rotosound Swingbass 66. Capacitor in on the horseshoe set to about three quarter volume and full tone. Toaster at full bore. Play behind the horseshoe with a heavy guitar pick for Roundabout. Play over the toaster for Heart of the Sunrise.
Drive the preamp stage of your Eden Navigator hard with a little bit of 1000K mid boost. I use D112XLTs with my setup. A Mesa, Ampeg or Eden 6 or 8 ten cab does the trick better.
The secret of a good growly Ric is not the bridge pup, it's how you play over the neck pup. Straight MIA P, PJ and J basses get close but their neck pups are to far south. It's the combination of sizzzz of a cap'd bridge high gain and boom of the neck that makes the Ric sound. Chris's older 7.4 K ohm toaster is soft and deep. The modern 11k toaster has more bark and the new high gains are killer.
Though I've been one of Chris Squire's biggest fans over the many years, I prefer growl that Dave Meros of Spocks Beard gets on his 4001 with high-gains. He's a big Eden endorser, BTW. I swear his sound on End of the Day could cure cancer. The other neat thing about his modded Ric is he has J pups in their correct positions in addition to the Rick high gains. He switches from Ric to Jazz, pick to fingerstyle and its Squire to Jaco. He's amazing.
My new 4003 has the same 11K ohm toaster as your V63. I can pull off a Meros or Squire "like" Ric sound even though I'm strung with DR Lowbeams. It's in the hands, the pick and the "neck".