Yeah make sure the bearing that turns the piston is not siezed or you need not only a piston and head but you will need the crank also. Then in my opinion you might be in the 200 range. It is still worth it considering you will have a brand new engine but if the carb is gone and have to rebuild carb add another 25 for carb rebuild kit. then your pushing it because you could have a brand new one for a few hundered more. Look at it this way youll gain experience with rebuilding something that is easy to rebuild. and youll have a brand new engine in your blower and save a feww hundered for a days labor.