If your going to build this you'll need a good machine shop to service your block. If you are patient and shop, you should be able to find servicable stock crank and rods (maybe even pistons). Just include the cost of having them serviced in the price you pay. These will be much less than buying all new parts (especially since the other guys are scrapping the stock parts to build 496 engines). BTW - the shop I use specializes in bbc so he has a lot of used parts ready to go at very reasonable prices.
I used the 30 over pistons in my 454, so I bought those new, my shop pinned them for me, and balanced everything from damper to flexplate.
Building a bbc isn't cheap, but for a good truck engine you don't need high priced high performance parts to get great torque, good horsepower, and less than desired fuel economy.
Not that I don't enjoy a totally wild over the top engine build, re: the v24-71 on the favorite engine pic thread,