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They are 110cc "marine" heads (anodized) with big valves. Summit says that the spark plug hole has been moved over .150 closer to the bore center. I can't imagine that would cause interference with the piston (9.8:1 JE @ 110cc).
They should work fine, the heads that come on the 505hp/502 crate engine are cast by Edelbrock as is the intake.
I have a set of the crate heads and they look just like the Edelbrock heads, the intake has a Edelbrock part# cast on the underside of it.
I have the intake for sale if you can use it, I bought a used 502 top end for my 496 I am building.
Mark G.