Keeping the cam short on duration will be in your favor with that shortblock. Your plan seems solid with the good flowing heads. For reference, I had a low compression 318 shortblock in my tow rig, and for highway towing (3.55 gears, 727 trans.) at 2500ish RPM, I used the old Cam Dynamics 272 Energizer (216*@.050"/.454") with "302" heart chambered iron heads with 360 valves. The tight LSA (110*) and short duration really made it punchy. Your heads will like that extra lift and the cubes can utilize that duration. I bet it provides grins!
