SRD Assassin's vs Cal-Trac`s?

One good option is to modify/move the front mounting point forward and use a 25" front spring segment. Much better instant center. Many of the fast, high HP NOS/ turbo 10.5 tire Mopar A-body guys are switching to the Chevy front segment for this reason.
Check the rules to see if this bumps you out of your class, though.