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I'm late to this.
As for HP, most windage trays will be in the single digits. Many claim no HP increase. I've only run one, back in the 60's, on a 427 and did no A/B test, to see if it increased HP.
Anything you can do, to control the oil will be beneficial, especially in keeping the upper oil, off the crank. Try to route it to the front and rear of the engine. Little things here and there can always help.
Regarding the pictured 49/51 pan, it is not a windage tray, that is a baffle and a fairly well designed one. Great for cornering, stops, starts and steep hills.
It separates the aerated oil from the pan oil but, doesn't to anything to control and condense that oil.
Ford may have added it to see if it reduced warranty claims, found it didn't and removed it from the last two years. My only guess?