Right now Colespeed is the undisputed speed champ with the Speedmaster SS - Nashville version. He ran it at Bonneville this Fall. Don't know any way to top that but to run and see what you do. Well, maybe a run at Maxton would qualify as well.
A guy in Philly was drag racing an America out of the MCS Triumph shop but he only posted once or twice than dropped out of site. That shop is no longer in my travels, so don't know if they continue to campaign that bike. I'm not aware of anyone else drag racing.
Time slips do it for me. You have the fastest slip - you are the fastest.