Right now the fastest tire is a Corsa Speed TLR. Put that onto a "modern width" tubeless 60mm wheelset and call it a day.
Don't bother as the tubular versions right now are a touch slower. I run tubs on my trispoke and disc wheel because it's marginally faster at the speed I TT at versus the CRR gain of modern size clinchers....for the money. But the drawback is a 19mm front 23mm rear race only setup. Not a daily rider friendly kinda thing.