Undersquare vs. Oversquare Engines

I wonder what effect the comparative mass of the rotating assemblies (namely crankshaft) would have on horsepower production.

What does a BB crank weigh?

FWIW my 5.9 magnum weighed 498 lbs when I brought it home. The Eddy heads are right at 50 pounds lighter than the stock Magnum heads.

I've been told 720 for a BB with aluminum manifold, but that's hearsay, not gospel. Could they really be 200+ pounds heavier? Right on the nose of the car?

I know a Ford FE goes about 650, which is about 150 more than a 351 (Windsor).