We own two Speedmasters. One had carbs and the other EFI. There is more relevance with the Bonneville Twins than there is with the Rocket or Thunderbird. The only commonality betweeen them is the classification.
2010 Speedmaster Black w/ New England White. AI Removed. TTP Breathe, TTP O2 Sensor Kit, TTP Tune 2, DNA Air Filter, Trident Exhaust (toned down w/ Acousta-fil and custom unvented earplugs).