Welcome to Sailnut. Nice introductory post.
Those old Sunfish hulls can take on water and get pretty soggy and become not so fun to sail.
The Pearson 26' is a good starter keel boat. Here are the specs for the basic P 26: PEARSON 26 sailboat specifications and details on sailboatdata.com
Pearson also made a 'Weekender' model that is also listed on that website. It has a slightly different cabin/deck layout. It is nice to know exactly which model you have.
It would be good if you could replace those keel bolts if they are as corroded as you described. I'd hate for the keel to fall off on you as the boat may not stay upright without the keel.
Also, where will you be doing most of your sailing?