Alright guys, I have a 400 bored .060+. Speed Pro Hypereutectic Pistons, Stock rods with ARP bolts, Cast crank.

My buddy is in the finishing stages of his 355 build, and regrets balancing his rotating assembly because when they checked it, they said it only threw off 15 lbs. Which isn't bad considering my BBC threw off 650 lbs lol. But the thing is, its $175 to get it internally balanced to 10,000 rpm. Is it really worth it? What do you guys think.
Thanks, Cory