Those specs suggest it could turn a 6x6 prop at 29,000 rpm, developing 1.3HP. The resulting speed would be in the 160s. Just arm chair racing numbers, it's probably got more potential than that if it can be tuned / propped just right. The limiting factor with most engines in this size range is the hole going lengthwise through the crank. It is a crap shoot to know how far that hole can safely be opened up, but I'll bet the C/L speed or German speed freaks know.