Replacing a crank shaft questions

Since your heads are ported, I'd think you would benefit from a more area-under-the-curve type of cam. I was not thinking MP, but one of the Howards cams optimized for the .904 Mopar lifter diameter. The Howards 710461-10 is such a cam and has an advertised duration of 273, but with a lift of .525". So a very similar cam in terms of low RPM torque (probably a bit better in fact), but it ought to fill the cylinders better in the mid range an up. Some thought needs to be made over the valvetrain and so that was why the question on using the stock rockers.

BTW, dynamic CR is not a index but another form of compression ratio computation, which reflects the effect on actual cylinder compression ratio and pressures, due to the point at which the intake valve closes on the compression stroke, which is typically 60-70-even 80 degrees after bottom-dead-center. With a bigger and bigger cam, that event occurs later and later and the resulting actual cylinder pressures go lower, and that effects low-mid RPM torque.

This makes less and less impact once the engine revs to mid and then high RPM's where the exhaust scavenging effect comes into the picture. But the DCR is important to evaluate if low RPM torque if important. And you also can use DCR as a check to see if your static CR and cam combination is off the mark and you are verring towards detonation-land.... not where any of us want to go.