I bought that tray a long time ago, so I'm not even sure if it's for a stock crank or a stroker. Can you tell just by looking at the pic?
More likely stock, since I had no plans for a long arm then (or now).

Don't windage trays work not by scraping oil, but by preventing oil from being sucked up and and wrapped around the crank (as mentioned in this thread)?

I have been considering covering the cutout with a piece of sheet metal riveted or otherwise secured over the hole. Not sure if it's worth the effort (and introducing something into the pan that could come off and block the pickup)...

Edited to add: Looking at the 440 Source pics, it's the stroker version. They now have a "brand new" stock stroke tray that actually covers more of the pan.
http://store.440source.com/Windage-Tray-Stock-Stroke/productinfo/127-1030/
Thinking of buying that one while the pan and K are still off...