Anyone customizing there stock 340 Windage tray?

The stock tray and pan should not be used with an engine that is expected to run to 7200. If the lifters were ticking you can be sure the lower end is suffering and you need to address the delivery issue. The weak point is the suction side of the pump. If you have not upgraded the pump and pickup, and the pan and windage control, you should. As RAMM said - Milodon is best.
The #4 main starving can be addressed with the valley crossover mod. The use of 45° fittings and the angles of the holes drilled are critical to slow down the oil in the galley and let it make the turn to the #4 main. Lastly - the oil clearances and crank grinding work MUST be perfect.
I have done the valley cross over as well as drilling everything up to the rt lifter feed 1/2" (matched rear main cap to the oil pump). diagonals from rt lifter feed down to the mains have been drilled to 5/16" Cleaned up the casting on the 4 oval holes and 5 smaller oil return holes on the upper end of the block, as well as drilling 8 5/16" holes between every pair of lifters for quicker oil drain back. Drilled 4 more 1/8" holes in the oil filter plate. Will be using Milodon 7qt pan w matching pick up tube and a cleaned up HV oil pump. Hoping to keep her alive @ 7000. Was previously running a hydrolic cam but am now going solid. Hoping the mods, as well as more oil capacity will help me do so. Dont want to be spinning # 5 rod bearing again. I would like a screen tray but not sure if anyone makes them for mopar. Have seen them for chevy. May just build one