I would go the 904 with the FCR. I rode Martys after he put the carbs on, he did not do any head work and that things goes like jack the bear! Pulls all the way through the rpm range in every gear....uhm and yes i was a smilin! So much so i was chocked to get back on my bike afterwards, i think he took some pleasure in that! LOL I will be doing the 904 with the fcr carbs for sure when i make the change.

2007 Speedmaster and miss it! 2013 T-Bird Storm and Luvin it! Catching a yellow jacket in your shirt at 70 mph can double your vocabulary