The more cubes your engine has, the more torque it will inherently make, and
the more cylinder pressure it makes, also the more torque it will make, and
To a degree, stroke makes torque.
So in the case of the Mopar SBM, what can be better, than a very high pressure 360? Of the SBMs it has the most cubes, and the longest stroke, and high pressure is just a piston swap away.