Thanks everyone. I've had some good luck with the 3 thru hulls ( 2 sink drains and anchor locker) that have no seacocks. They all came out with just some rigorous coaxing. The previous owner had recored them, saved me that step and now I just need to add some seacocks and base plates to the thru hulls.
Chris, I like your anchor locker solution. I'll look for that Forespar fitting online.
Sam