1958 MERCURY SUPER MARAUDER 400 HP TRIPOWER ALUMINUM FINNED VALVE COVERS - RARE!

Description

There is not a lot of information on this particular set of aluminum finned valve covers but I believe they were specially made by Moon for the 1958 Mercury Super Marauder 400 horsepower engine.  It was only produced for one year and only available in a Mercury or a Lincoln. It is estimated that only 100 of these 400 HP engines were ever produced. How many of these valve covers are left?
This set of valve covers came with a 1961 drag boat that I bought about 20 years ago.  The previous owner had blown up the 430 engine and kept most of the parts. What I did get was the air cleaner (I sold it) and these matching aluminum finned valve covers, the oil pan, lifer valley shield and bell housing.
The valve covers are in pretty good condition with the exception of 10 small holes that the previous owner drilled into each cover on the intake side as a breather. These covers also have what look like a few shallow porosity holes from the casting and a few small scuffs and scratches.
Overall they look pretty good for their 60 years of age and are fully functional.
Please examine the photos for condition. There are NO cracks or major damage other then the holes.  The last three photos show what similar covers look like on the engine.
Here is some info I found online;
Air Cleaner Assembly
The air cleaner sets this engine off from all others, prominently displaying "Super Marauder 400HP" for the Mercury enthusiast.
Sold for ,450 in Nov 2006. Lot contains an air breather, three two-barrel Holley carburetors, an intake manifold, valve covers and a fuel pump, plus 15% buyer's premium to auction house.
NOS Mercury Super Marauder air cleaners still pop up from time to time but they are very rare. Recent asking price for one on Ebay was ,500.
Lincoln Application
The setup was also dealer-installed for Lincoln and a separate "toned down" air cleaner was used for the more refined enthusiast who didn't need to advertize beyond the compound lines of the most radical yet elegant and expensive Lincoln produced at that time, likely a 1958 Continental Mark III.
Sold for ,900 in Nov 2006. Lot contains Lincoln air breather, three two-barrel Holley carburetors, an intake manifold, and a fuel pump, plus 15% buyer's premium to auction house.
Stroppe-designed valve covers
1958 Mercury Super Marauder Mold and Valve Covers. Advertised as: Double-shrink wood and aluminum molds used to produce aluminum valve covers to fit the Mercury 430 cubic inch 400 horsepower Super Marauder engine. These engines were modified by Bill Stroppe & Son in Long Beach California to meet NASCAR requirements and were produced in limited numbers making these engines (and valve covers) extremely rare. Probably the last mold in existence for these valve covers. Sold for 0 in Nov 2006.
In 1958 Mercury introduced “a complete family of revolutionary new Marauder V8's with cool-power design”. They were based on Ford's MEL engine design (Mercury-Edsel-Lincoln) first released in the 1956 Lincoln. This new line of engines would be Mercury's first use of the Marauder name in a production automobile.
There were four Marauder engines in the Mercury line for 1958 and only the low cost Medalist did not use a Marauder engine.
The Monterey and Commuter used the “Marauder 383” 2-barrel engine (312 hp). The Montclair, Voyager, and Colony Park used the “Marauder 383” 4-barrel engine (330 hp).
Park Lanes came standard with a “Marauder 430” 4-barrel engine (360 hp). And if you needed more power than this, all models were available with the exotic“Super Marauder” engine. This was a 430 6-barrel engine with an incredible 400 hp. It was the highest horsepower engine available in any American car in 1958. It was also a Lincoln-Mercury engine only, not available in a Ford.