which is better??

So no need to replace the oil pan?? Sorry I've never done engine work before and have been doing crazy amounts of reading and learning as I go....So I am going to get the guy to drop off the Magnum this week...

Is there anything I need to worry about with the engine?

I know I still need to purchase a rear end, and transmission....Anything else I should be looking for...I'm guessing best options for rear are a 8 3/4 and a 727 tranny

What cam would you suggest is best