Just orded new headers from Layson

I just orded headers from Layson, see pic and Layson discription.
As I see if these headers are in principal Spifire headers.
Am I wrong?

HS-22MOD
Small Block Headers:
Headers - A-Body Small Block - Now for those that have modified there original cars to accept a Engine Swap Kit for these early A-body's (1963-66) we have a specific header for you guys as well. The #HS-22 will not fit for those cars that have the Engine Swap Kits (slant-six to a small-block V8, 273, 340 or 360 V8) - but these headers will workSpecific for Engine Swap Cars