Just looking online at some different parts and came across a company out of Dallas TX called Adept performance. They have a 4340 steel crank for BB Mopar for $500, says it will hold 1500hp. Too good to be true? seems like everything they have on their site is like that, for mopar,chebby and ferd. Heres there site:

http://adeptperformanceproducts.com/