Sons 300m and I need help please!

So the story continues:
We deemed the Chrysler to have a bad rod bearing.
After a quick search, my wife and I decided to purchase a "new" used car for him.
Got a good deal on a 2003 Grand Am GT with low miles...Car runs like a champ.
Over the winter, I continued to delve into the 300m to see what where the problem was.
We continued to hear sounds from the top passenger side of the motor.
4 1/2 hours later, had the valve cover off and it was clean enough to eat left overs on.
Some more research taught me the oil pan is a 3 layer pan. 2 aluminum and 1 rubber in between to deaden noises. That is why I could not hear the bottom end.
#5 rod bearing spun. Crank looks good and so does the rod BUT I do not have a Micrometer to put on it.
Questions are,
Can I put new rod bearings in (~ $50 for the set) and move on? Engine had/has 50 psi oil even now.
IF not, what does need to be done? Not for the perfect rebuild, but to put it back on the road with confidence...