Well technically to have 5.0 liters of displacement, it needs to be a little over 305ci. The "5.0", is actually a 4.9. I would say stay with name brand, there are a couple of rod/piston combos, as mentioned with the whole wrist pin in the oil ring land situation, an oil rail support is provided with those style pistons.
If you just want to add 25-50hp, look into doing cams and maybe heads for the extra bump. I would not recommend doing the stroker if you are not going to add the extras like the stage 2 or 3 heads, and cams to go with it.
Here is my suggestion.... if your not going to run a turbo or build an all out nasty N/A or spray car that your going to rev high.. there really isn't a point. Most people will never fully utilize the potential of the stroker motor. Its the reason why many people think its a waste.