340 Rod questions
Per the 2006 AERA crank manual, the thrust width on the crank is 1.156". Do a search for the AERA crank manual and you can find it as a free downloadable .pdf for that year.
That is quite an interesting crack on your crank throw! Hard to predict if it will ever fail or not. I had a cast spindle on a rally car they held for many races then finally let go; cracked right across a casting void.