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If the heads say the max lift is .575" it has to mean the valve springs are the limiting factor since the head manufacturer doesn't know anything about the engine you are going to install them on. This could also be the reason for teh 5500 RPM limitation as they probably wouldn't flow enough at that lift to handle the higher RPM requirements.
I would think the XE282HR would work fine if you buy the cam and the comp cams recommended springs to go with them along with some good keepers and locks.
Check with comp cams to be sure of all of this, but an awful lot of guys use that cam on 393 strokers and love it.
If you already have the heads, they should work fine for your street car purposes. It isn't like you'll be running 6000 RPM on the street very often. However, if it were mine and I hadn't purchased the heads yet, I would go with the Vic. Jr. heads for the increased flow numbers and the springs that come with them are good for .650 lift and they come with valve guides also.
Good luck with your project.
Bob
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