One of the earlier dealers, I believe in Baltimore, put 100 feet of chain the the 25's, and it may have been 50' in the 22's to "get the bow down, and run better going into chop". It does that, but also you have to trim up, when running with higher waves to prevent bow steering. G4 1/4" chain weighs about 0.75 lbs per foot, so 50 feet will be about 37 lbs. That with an anchor comes close to 50 lbs in the bow. The original boats were designed lighter weight 75 hp 2 stroke outboard. Also most of us put a second battery and larger fuel tanks than "original". However we like to have as little weight as possible in the ends of a boat.
Please by chain made in the USA--It may be a little more expensive, but I have seen Chinese made chain fail, under what seemed to be "normal" loads. Mention is often made of the "Cantenary" effect of keeping the pull of the chain parallel to the bottom, and the rising of the chain as a "shock adsorber"--true. Until the wind sets at 40 mph, then the chain will all off the bottom, and no longer as effective. A Kellet can be added near the rope to chain interface which will increase the cantenary effect.