Dyno a 7.5:1 400? Sure, why not?

Scott's dart said
Has anyone had any experience (good or bad?) With either of these heads?
And do you think this combo will work okay? See anything that might work better?

I had stock 440Source heads on a 440 and they seemed to work alright, a friend has them on his 400 and that's a stout engine, in a 69 Super Bee.