Brodak is a better engine in my opinion than the la 25, if you can get your hands on one, out of stock for a long time.  The aac piston and sleeve are much more durable than the la.  It may seem a bit weeny with the stock venturi, but it can be opened up some if you need more power.  I just bolted mine onto a airplane and started flying it with a 9-4 prop. The third flight was an official OTS flight. After  a fair amount of flying old time stunt, it is now on a super slow rat with a .340 venturi.