I want to build a 454 for the blazer. I want to find a block and start building it slowly, then hopefully swap it in this summer. If I were to buy a block and build it from there how much would that run me? I found this on craigs list: http://austin.craigslist.org/pts/244906431.html Would this be something good to start with? What years/casting numbers are better? How bout heads? Thanks for the input.