Heres some info i found on shitipiedia, take it for what its worth...
Ford developed the MEL ("Mercury-Edsel-Lincoln") engine series for use in their line of Mercury models from 1958 through 1967. The MEL also replaced Lincoln's unique Y-block design. These engines were produced in Lima, Ohio at Ford's Lima Engine plant. They were replaced by the 385 series engines.
All MEL engines had wedge shaped combustion chambers formed between a flat head surface and an angle milled block deck (10 degrees off square with the bore axis), with the piston top determining the compression ratio and combustion chamber shape, similar to the Chevrolet Big-Block 348 combustion chamber, also introduced in 1958, and the later 409. Unlike the Chevrolet, which had staggered valves and scalloped or M shaped valve covers, the MEL valves were inline with shaft mounted rocker arms like the FE model Ford engines which were introduced at the same time. As with the previous generation V8's, an open runner intake manifold was used, requiring the use of a stamped steel lifter valley cover similar to that of the Pontiac V8 engines. Also, the intake manifold provided no exhaust crossover passage to warm the air/fuel mixture, relying solely on the heat riser mounted over the left exhaust manifold to provide heat for warming the air/fuel mixture.
The MEL was similar to the Ford FE, with the same oiling system, bolt patterns, and valve stems, but was even larger. The main bearings were 2.9 in (74 mm), while the rod bearings were huge at 2.6 in (66 mm). The connecting rod beam had a unique triangular shape with the shoulders for the bolts sitting low toward the cap mating surface (1/2 in.).
410
The least-common MEL engine was the 410 cu in (6.7 L) E-475. Bore was lower at 4.2 in (106.7 mm). 10.5.1 compression, a Holley four-barrel carb, and hydraulic lifters pushed out 333 hp (248 kW) and 475 ft·lbf (644 Nm) of torque. This engine was only used in the 1958 Edsel Corsair and Citation.
*EDIT*....
I found there was another 410 V8 produced....probley the one you seen...
410 cubic inch
This is a 390 block with a 428 crankshaft
Four barrell carb.
The stroke is increased .020 in for a total of 3.98 inches
Only used in Mercury vehicles from 1966 to 1967
The second one sounds more along the lines of an FE, but that MEL engine sounds intresting...475ftlbs....i bet thats a fun engine...thats almost as much torque as a 440 mopar.