The stealth heads are fine for what your doing, and the springs/retainers will work with that cam.

I have a set of stealth heads for a 440 I am building, and I checked them out and they were good to go out of the box. I also know several people who are running them out of the box (un-modified) with no problems, but these are all mild hydraulic cammed engines, and the heads were bought for their stock appearance.

I think those that dislike the stealth head are those who think it should be race ready out of the box. Just because it is an aluminum head, does not mean it is a race head, although it should be good for 500+ HP.

I'm not sure what people expect when they buy the least expensive heads on the market?