that wiesco crank is fine, whoever you have do the port work, have them check it out, balance and weld it.
There is power to get out of the stock cylinders with port work for sure. basically you need to figure out what it will cost for each setup, (stock cylinders, porting, ETC) or (driveline cylinders, porting, ETC.) you can definitely get more power out of the aftermarket cylinders, but it all depends on what is costs.
another option if you wanted was to buy some virgin cylinders, and then upgrade to a 4mil crank and gain power as well.