Is a 1991 360 balanced like an la no matter what

I ordered a refurbished magnum 360 from Jegs. However looking at the stamped numbers it seems to be a 91 which means it isn’t a magnum. However, if it is an la the loss of power is alright because it should bolt up easier but I need to know if it will be balanced like an la even if the engine has magnum heads and all of the subsequent changes.