66 Dart GT HT Whatsitgonnabe?

I know I'm getting ahead of myself but I wonder if this could be a good cam for my low-end torque monster.

http://www.manciniracing.com/hyd268272dur.html

Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,500-5,800
Duration at 050 inch Lift: 228 int./231 exh.
Advertised Duration: 268 int./272 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.450 int./0.455 exh.
Lobe Separation (degrees): 110

I've got a lead on a kit with lifters for $150 here in Sweden.

With the magnum heads I should get a decent compression ratio.

Here's the one I've got in now:

http://www.manciniracing.com/hyd280280dur.html

Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-6,000
Duration at 050 inch Lift: 238 int./238 exh.
Advertised Duration: 280 int./280 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.474 int./0.474 exh.
Lobe Separation (degrees): 110