over heating problems with schumachers?

Im changing my 440 duster from a street/strip setup to street. I currently have 9.7 compression, .557 mopar cam, muscle motors 452 heads, M1 intake, TTI headers, 4;30 gears, 727 full manual vb. Im planning on going to schumacher headers for ease of maintenance and room. Probably a mild roller cam, dual plane intake and a gear change. Ive heard two local opinions that the schumachers will create an over heating issue on a 440. I dont take the opinions of these people very seriously but thought I would ask any way. I find it unusual that this would happen with a mild set up. Any opinions or experience with this? thanks