I've heard that as well, Ed. I think I remember reading that one of the last versions of the 2 liter GT dynoed at 190 hp at 7,000? 7500 rpm (maybe in a 904)? That would be a blast in a Speedster!
Indeed it would. But you could have a 200hp Subie or Type4 for less than the cost of a 547 cylinder head. And it wouldn’t require a $1,000 tuneup every 10-15 hours.