Question about stock cam specs

[MustangGT1990]

I just wanted to thank everyone for their input so far, especially Chris. I am rebuilding my 5.0 after 196,000+ miles. It was still running fine BUT it was leaking oil really bad. Anyways, I'm still curious about my future cam. I don't want to do anything too radical because this is NOT going to be a racer. It is just a toy for those pretty days and weekends. In other words I'm more worried about bark than bite. I currently have stock 3.08's but I have a set of 3.73's to go in later. I know the stock cam is a pretty good one considering it came from the factory. I have a 65mm tb, larger mass air, my STOCK heads have been ported, better headers, Flowmasters, and a catless H-pipe(for the bark). That is as far as I'm going on this car. Like I said it isn't going to be a racer. Essentially it might breathe a little better than stock but thats about it. This leads me to my cam choice. I know lower gears will help me some BUT I don't want to move my power band too high in the RPM range and have that "sluggish" feeling when I accelerate (or try to). Also, I know alot of the "off the shelf" cams like Crane and Comp have lifts in the range of .533" and .544". Are these lift rates safe with my stock heads, valves, and the stock 4 relief pistons? I greatly appreciate your responses!