In-line versus V-8 has little to do with any of this. An in-line engine with ladder-frame block construction is more rugged, but not more inherently powerful.
The Cummins 5.9 outdoes the Ford-IH V8 because it has much longer stroke, direct injection, and higher turbo-boost. The 94 Ford-IH 7.3 I mentioned has indirect injection, a max boost of 7 PSI, and a relatively short stroke (4.1") as compared to the Cummins (4.8").
Long stroke can give high torque in any engine, gas or diesel, regardless of V, Boxer, or in-line. Just not often done in V-8s.
Now . . . you say your CIH 7220 will "outwork" your Dodge truck? When is the last time you took your 7220 down the highway at 90 MPH?
Also, in general, wouldn't anybody assume that a bigger engine of similar design can do more overall work then a smaller one? So, you think your 505 cube engine can do more overall work than a 360 cube engine and you are surprised?
Anybody that screws around with engines knows that horsepower specs alone mean next to nothing.
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