There's a write-up on the 303 at SpinSheet – Chesapeake Bay Sailing
by Jack Hornor, professional surveyor and naval architect. Also, join the Pearson email list here on Sailnet and ask your question. Lots of 303 owners on there. I also can send you an email address for a fellow who maintains an owners list. Will do that later via PM.
They are nice, roomy boats for cruising. Not the speediest, however.
Disclosure -- I have owned 2 Pearsons. Current one is a P-33-2.