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if its forged, does that mean it is externally ballenced?

NO, all the early forged steel 413 and 426 Wedges are internally balanced The 413 industrail pistons are really heavy, very thick tops and a full dish to boot The first forged steel cranks that where externally balanced where the six pak rod Magnum 440 in 1970,1971 and some 1972 perhaps also, I think what are you trying to make or use that crank in?

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)