big block dart project
This is so far out of my league it's not funny.....But if you're building your own, besides 440 Source, it wouldn't hurt to nose around here also...
http://www.musclemotorsracing.com/stroker-category/440-stroker-kit-article.html
Keep us informed on what you eventually choose. It will be interesting on the cost benefit with the 4.5" stroke, considering all the extra short block prep involved vs a 500" assembly with a good pair of heads and matching valvetrain.