Good enough for what?
You've got a pump, radiator and block, so the thing will work, but as far as performance it depends on a lot of things.
-what are you cooling with it, and at what speeds/voltages?
That could of course be called "good enough" as it will obviously be better than any air cooling around that doesn't use a leaf blower, but it all depends on what you want your system to do for you.