Replacing a crank shaft questions

like_A_pike said
If it is internally balanced then this Scat 1-98003BI: Chrysler 340 Series 9000 Cast Street/Strip Rotating Assembly 372ci | JEGS ?

plus a new harmonic balancer?

Only if you're building a stroker, that is not a stock replacement crank. Is that what you're after? Please elaborate. See posts 19 & 22 above.