The ASP line of engines are reasonably well made and good value, here is a review of the larger ASP .52:
http://www.rcmodelreviews.com/asp52_review.shtml
We used to run ASP .12 at my club in the 90's with 18"<20" hulls and they were zippy. Should perform well in a SK Daddle which was run with a .35/.40 loop scavanged in the 70's. Here is a picture of another SK Daddle(sadly for electric!):
http://www.rcgroups.com/forums/showp...0&postcount=13
HK has spare parts for them:
http://www.hobbyking.com/hobbyking/s...r=&LiPoConfig=