Looking into the summit cam/lifters kit.

The engine in question is a 1978 440, standard bore, stock pistons, untouched 452 heads, cast iron manifolds. Engine is going in an 80 ramcharger, 35" tires, unsure of axle ratios at this point, 727/205 combination.

I would like a fairly low power band to get this beast moving, I'd like it to "sound" like it's got a hotter cam in it, and I'd like to not sacrifice drivability or vacuum.

I saw summit lists two camshaft kits:

The SUM-K6401 which is 282/292, .465"/.468"

The SUM-K6400 which is 272/282, .442"/.465"

As I understand it, the lower duration brings the power curve down a bit in the RPM range, but obviously at the sacrifice of lift. I would also prefer not to have to change to different springs, unless not doing so would leave something on the table.

The truck will be daily driven, mostly road but the occassional weekend jaunt through the rocks.

Appreciate the help!

Cheers