Scupper replacement??

[seastrike]

I want to replace the scuppers in my 1978 20 foot master angler, i believe thats what you call them?? If not the two drains in the back of the boat.

What is the proper way to get the old ones out. What should i replace them with?? Brass maybee?? What about the angle of the hull, or do i just use a good bit of 5200 to fill the gap left by the angle of the hull?