Stock Magnum rods/pistons durability ?

I have the heads off my 5.9 Magnum that has just short of 150,000 miles on it. The bores look good with cross hatch marks, and my measurements so far looks like the bores are good and round. I checked the compression before I took it out of the donor truck, and it was in the 145-150 psi range, with one cylinder at 135. My original thought was to freshen up the rings and bearings, have the block hot tanked and new cam bearings put in, and putting a Performance Injection Equipment top end kit on. My main concern is with the 150k miles, the rods and pistons may be a little tired for a projected 400-450 horsepower engine. I was wondering in anyone had ran something with that kind of mileage on them. I could just put new rods and pistons in, but at that point I might just as well go all the way and do a stroker kit. The engine is not going to be ran hard, just a fun street cruiser.