You won;t have to rev it 7500. If all you had were mushy small blocks in the past, this combo will be a huge eye opener. As far as cams go, is this going to be a weekend type fun car, or do you plan to run it cross country? If it were mine, I would be building it on the more radical side, as I don't really cruise my car all that far in a givin trip. That many cubes will need a fairly large cam. Not necessarily lift, but, duration. The more lift the better obviously, but then you get into more longevity issues with lifters and springs.
If it were mine, I would put a cam in it that had a lot more duration than most guys would even consider for a " street" car, but, like I said, I live no more than 15 miles from numerous cruise spots where I live, and, I am big into drag racing, so, if I built a big engine like that, I would want to take advantage of it. With that said, I would have 2 sets of intake rockers, like a 1.6 and a set of 1.8 or 1.85:1. Use the low ratio rackers on the street to keep the loads down, and max it out with the high ratio rockers for the track. Knowing me though, I would just run the 1.8's all the time, and just keep tabs on overthing. But, I would be in the 280 range at .050, with .800+ lift, with wide lobe sep. If thats too radical, then something in the 270's, with mid .700's would be good, and I would use a lobe that wasn;t quite as aggressive, like a Comps Hi-Tech roller lobes.
To know for sure on the cam, what your plans are with the car, and what you want to do with it need to be known.
Frank
Advanced Performance
www.get-ap.com