anyone balanced a stock 360 crank?

KB K107 pistons, stock 340 rods, stock crank.
I used a B&M counter weighted flexplate & aftermarket Balancer with a bolt on weight.
I had it balanced externally to keep the cost down. I built the engine to go into a street car & it ended up in a race car.
The engine has 900+ passes on it since 2007, no concerns yet.
It has ran a between 11.20's & 11.50's depending on conditions.
Internally would be the proper way to balance it in my opinion.