73 duster 318

If he does not want to pull the heads an do any head work I think this would be a better choice in cams. I would match it up with a eddy performer and a 600 holley with a good set of dual exhaust and run it.
http://www.summitracing.com/parts/LUN-60401/

X2, i like this also. My opinion is the Performer is a little better with stock compression on a 318. There's always good Performers for sale used and the money saved there and with the "600" Holley would get you a set of 340 replacement valve springs which your gonna' need to take full advantage of that cam.