Help! 383 or 400?

[GMC_Aaron]

I am considering the possibility of bulding a 383 stroker for my 1972 GMC, but I am also throwing around the idea of a 400 based on some of the threads in this site. I have read that it would be cheaper to build a 400. The Chevy small blocks are so versitile, it makes things confusing. There are so many choices out there, but I know I want to go with a 383 or a 400. With the 400 I get more cubes. I'm thinking with the 383, why build a smaller engine at a higher cost? Another question is, what about parts for the 400? Since the small block Chevy is so versitile, are all the parts the same up and down the line? Are there any parts in regards to the 400 that are hard to get? Would the heads from my 350 bolt right on to the 400? I'm just weighing possibilities and scenarios, but any feedback on advantages and disadvantages would be greatly appreciated. I've also read that 400 2-bolts are better than 4-bolts. Why is that? Thanks guys for the input.