As a member of this forum once told me years ago. "The Leaks, came factory installed on our Chrysler's."

(Windows, etc.)
Seriously though, you need to float it to know if it has any issues. As stated above there will be seal squeeze out everywhere. Could be that in the past the keel pin and brackets were replaced on your boat. I too would put in a boat load of seal for maximum squeeze out. Frankly I find a lot of do-it-yourelfers are not real good at faring out seal. (Paintbrush and prople-alcohol work real nice for faring out seal.)
When you launch keep the trailer ready to recover the boat should there be a leak and you need to re-load the boat quickly.
Give it a try, I bet you will like it, Sail on my friend, sail on.
Thanks
Alan