I know a windage tray makes a noticeable difference on a 360 Mopar
Built one for the street in 95 for torque and mileage in my daily driver Fifth Avenue and did everything to reduce friction and increase reliability that I could.
Used a windage tray, double roller chain, ported the exhaust ports slightly and blended all throats and bowls below the seats, back cut the exhaust valves, bullet shaped the new guides and did a 5 angle valve job.
Re-rung the stock pistons, decked the block, had to turn the crank .010 and .010, new cam bearings.
Used a 78 Thermoquad 4bbl intake and 74 non-emissions 800 cfm Thermoquad, Torque Plus intake gaskets (like door screens across the port)
MSD-6 with Blaster II coil, gaps out to .060, Jacobs plug wires, and an MP vacuum distributor tuned like this;
Thing knocked off 23mpg (American gallon) at 75mph all day on the hwy and 18 in the city. If you could drive under 60mph it would return almost 26mpg. Came out of the hole like a cat if you stomped it and accelerated at part throttle effortlessly from idle. It rarely had to kick down to pass, even going up hills.
It's amazing how much power is there for the tuning on stock North American engines, without having to resort to the Chevrolet-way aftermarket speed parts.