Being realistic, a street engine can only handle so much cam before it begins to lose power. Larger cam does not = more horsepower. There are a lot of things to consider. Since you are putting a Comp Cams cam in it take the effort to check with their tech dept. and ask for their input.
As long as we are being realistic, think about this. Do you have any idea as to the likelyhood of a 327 single carbureted engine pulling 500 HP? There has been a lot of serious engine builders over the years that have been trying to do that unsuccessfully.
A fellow just the other day was looking at a car I am building. He said " My engine would look good in that car. It is a 383 stroker pulling over 600 HP". Turns out that it is a single carbureted engine also. It was all I could do to keep from telling him, "Bull S--t. I built an engine for this car that is a 383 stroker with fuel injection, siamese runners, full roller, and if it pulls over 430HP I will be greatly surprised.
With your engine bored .060 over you will be pushing about 333 CI at best. You would almost have to be pulling 1.5 HP per Cubic Inch and that aint gonna happen unless you are on an unlimited budget. If you can squeeze much more than 1.0 HP per CI you will be really lucky, or a much better engine builder than I am.
Techinspector will back me up on this I am sure. (Maybe)
Ed