I don't think they would nessacarily run bad on a smaller engine than 600CID... it just might not run to it's max potential. Sort of like how I have heads that flow 340 CFM on a 410 horse 392, yes I could easily bump it up to 440 CID a couple more points of compression a huge cam and make 700 HP but it runs just fine on a lesser engine. I really don't think my engine will run any better with a 200 CFM head even though that's all you need to make 410HP.
Yes, I don't plan to spend the money to run them to their potential just yet. So there is room to grow, and from what I see they have about 150HP more potential them a similarly prepped B1 build. Although your comparison is good in theory and valid to make your point, your Hemi will not make 410HP with 200cfm unless you make some more aggressive changes to the engine, which is my point/reasoning.
