Hipster
I'm Awesome
I don't think you'll find a lot on this because the cost and effort don't justify the power results. Also the 305 block has some inherent design weaknesses that are hard to ignore.
If you want to do this just for fun and to try something different, go for it. But if you're looking for the best bang for your buck power, cost, and reliability wise, this isn't the way to go. A 350 swap will definitely be a better choice in that regard. A crate motor is one option, yes, but you can also go with a decent used block and a little machine work.
I've never heard that a 305 2 bolt block is inherently weaker then any 2 bolt 350 block. ?? The 305 vortec heads can be a big limiting factor though.