I think the Edelbrock LD4B and the Weiand Stealth are the same thing...

Here are some rough measurements from junk in my garage

Stealth 1.95 x 1.00
Performer 318/360 1.95 x .96
Victor 340 2.04 x 1.03
Performer RPM 2.17 x 1.00
RPM Air Gap 2.17 x .98