400 with TF 240 heads - valley plate options?

Does anyone know if the 440 Source pans work with these heads? They say the Edelbrocks & Stealth heads work but not certain how they compare to the 240's? The price is definitely in my budget....plus, no fabbing required.

Might help to post a pic of the area in question , many of us dont know what ur trickflows look like at the deck surface .