340 Static Compression Numbers and Test Procedure

Yes, that's the right area for the old pre-70 damper.....

There are holes like that in almost all of them for balance of the whole assembly, to make the part itself neutral balanced. That looks like a standard neutral balance damper.

I'll be honest... that old? No way the elastomer is going to work like it should as a damper. The rubber absolutely will have hardened up with 50+ years of time and unknown years of use and exposure to engine heat.