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These are the generation of Slant 6 225 engines and valve covers I am familiar with.
Had the 225 with the factory 2 barrel in my '78 D100 Short Box Truck, for the many many years that I owned it.
Had the 225 Slant 6, one barrel that originally came with the '76 D100.
Had the 225 Slant 6 one barrel with AC that originally came with my '74 Dart Swinger.
All had the same base 225 Slant 6 engine with matching blue valve covers.
Good Generation of Engines
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