i dont do chevys myself i'm a ford guy.... but i can tell ya that you'll want to get it balanced even if it does say balanced assembly..... just to make sure, along with a clearance check...... cause even if it seems to clear when you hand turn it doesn't mean it will at say 5500 rpms...... shouldn't cost ya more than $100-$150 to have done.... last time i had a balance done it was by an expensive shop and they charged me $80