Crank pulleys will not bolt to balancer

Here's what I'm working with.

1965 motor (273) replaced with a 1974 (318) into my '65 Barracuda.

Just installed the 318 this weekend and while trying to get the crank pulley assembly bolted to the balancer, one hole will not line up while the rest of them do!

I set the pulleys back to back on each other and I have one hole that is a crescent shaped sliver off....

I ordered a 318 balancer when I started my 318 build some time ago.

Whats the deal on the hole alignment being off like that?

If you look carefully, you can see how much the hole alignment is off!!

Is my only option to get a balancer for a 273 and will it work on the 318 so I can use my original pulley set up?

Thanks as always FABO

Dennis