Packard Eights also come in "big block" and "small block" configurations. If i recall correctly, the '48 Super Eight would be 328 cid, while the "Custom" or "Clipper" would be 288 cid. By 1953-54 the Super Eight was 356 cid. A four-barrel carburetor was available on the later models. Given the weight of these engines, the difference in displacement--and, therefore, horsepower and torque--is no small consideration. If a standard transmission--not the "Ultramatic"!--is available with the engine, don't let it slip away.
God's Peace to you.
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Inliner #1450