Ah. I thought it was a later block allowing for factory hydraulics. In any event... In terms or cams, you want what the heads will work with. With stock heads and a full exhaust the trend was to give it more duration and a little more lift. I still believe that's needed, at least the lift part. But many cam companies are spec'ing shorter durations and less lift, but timing the lobe's opening and closing ramps better with piston motion so the piston pushes out the exh when the piston and crank have maximum speed and pressure. Then the cylinder is sealed to allow for a better intake fill with less overlap and wasted intake charge out the exh. If you are going custom, then that is the route I'd be advising you go. Truthfully you need to know what the heads flow before you get too concerned with getting "the perfect" cam. As without accurate flow information we're all just guessing with some experience.