Help me to choose the right cam

The first cam is pretty big for your application. The 2nd one is a strange cam. It isn't a good choice either. It has a real small LSA and has a huge split pattern on the cam which the big block mopar doesn't need. It won't hurt anything but you can literally look at the exhaust valve on the head.

I'd go with something like this
http://www.summitracing.com/parts/crn-683801/overview/