I have a 60 or three like this, and it's better than moderate power, 16,000 rpm on the ground. Tunes well, really comes alive with a header and pipe. Check Robair81 on fee bay, he's got a lot of parts for these in stock, and he sells them for $129 last time I checked.
The cast ones are Picco, and it's difficult to tell them apart other than the carb. The Picco is a tad stronger.