Well, in the bigger picture, I've heard a rule of thumb that 200psi is the target for pump premium, tight quench and aluminum headed v8's.
'All motor' Honda drag cars routinely run 300+ psi cranking pressure, and I've heard of super fussy guys getting 270psi to work on the street with everything ideal.

In our case, iron head and less than ideal quench/squish (unless you done some mods to make it so), I'm not surpised you are on the ragged edge. My 544 motor with nothing stock inside, caused me some worry- I'm getting 180 on the front cylinder and about 155 on the rear 3, that will eventually come up to 170 with way more rotations of the motor. (Note to self: Self! Run air cleaners next year). Anyway... point being, I thought it should be higher, and think I'm going to make it higher.

As far as more reading on the topic check out : http://victorylibrary.com/mopar/mopar-tech.htm#data

There is a good article with Mopar V8 examples somewhere linked off there, and there is a little applet-kinda deal (PhilS can correct my terminalogy) at the bottom, that seems to do all the math. I haven't used it yet.