the QCYC use the following guide line
for all the sail and power boats. Since the QCYC is the Philadelphias oldest YC i think they have come up(or copied) a good measure.
10lbs per 1 foot of boat, mushroom anchor
chain 5/16ths 2x the depth at high tide
3 swivels, one at the mushroom, one midway up and one on the float
1 good float I always used the taylor with the rod running right through it and a swivel on it
bridles,2x the height of the bow to the water
even with the gravel on the bottom the anchor
will bite into it if the shank is the right size.
This configuration is not the panacea. you must PM your mooring and unwrap it every once in a while.
What did you use to pick up the 1200 lb weight at the end of the season??