Swapping in a big block
Not to belittle this sight or anyone here. Lots of knowledge/knowhow here!
But this sight may help you in your quest. Great tech section!
http://www.bigblockdart.com/
As for frame connectors,the above sight has a do your own page. As well as a page on converting your K frame to a DC big block frame.
I personally like these and will be using them. Several people here have purchased them and were very happy.
http://www.uscartool.com/Aframeconn/index.html