Engine Mount Help

Dave Lucas said
On my 63 Valiant slant six 225, I had to put a 1/4 inch steel plate under the passenger side motor mount. It's because the distributer was touching the wheel housing. Are my mounts just old and dead?

Yes. Replace all three.

Or is there a difference in how tall they should be?

No. All '62-'66 A-body Slant-6 mounts are dimensionally the same.