That's definitely a doweled bearing. The other type would have a notch and tab setup like the attached. (This is a rod cap, but the mains are set up the same way.)

If everything else is the same dimensions, a notch could be cut in the block and caps and the tab type bearings used. Might take some head-scratching to figure out.
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Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.