http://www.thirdgen.org/newdesign/te...nguprear.shtml
http://www.ws6transam.org/10bolt.html
a 7.5 is strong enough to put a lot fo full weight cars into the 10's routinely. you jsut have to take a few steps to help prevent case deflection and you will be good fro years of happy use.
both of these articles show the steps to take and the correct parts to use to make a strong 10-bolt.