If taken from muddy or "strong" water, cleaning out in a tank of clean water seems to help a lot.
I don't remember the exact recipe for the chowder we used to make, but I think any fish/seafood chowder recipe would work fine.
I know we first browned the meat in a skillet, added a little chopped onion when it was near done - perhaps garlic, Old Bay, and salt and pepper would be good here too. Then put it in a stock pot with tomato juice, chopped celery, carrots, diced potatoes, salt and pepper. I think a little parsley and chopped anaheim or jalapeno would add greatly to it. If you like you can add corn, though the starch of the potato be too much.