Ya the carrera is the 20.5 elite at the prop now is 21 three blade quicksliver and the ears are round on the prop.
I had a Advantage 20.5 Classic that I put in a 320 hp small block. I got 66 mph at havasu with a mirage prop. I tried alot of other props 3 and 4 blade (not merc props) it sure did like that mirage prop, made 3 mph difference for me.
Clint