I have done it on quite a few 63-65 B-bodies....moving the entire engine&trans inch and a half rearward changes the weight transfer,with SS springs&a snubber.....the launch is awesome!the best shocks you can buy are a must....when you launch and the front end comes up and does that little shimmy dance when you shift....it settles down and hauls the mail!yes you will need to modify the trans mount, i made a simple flat plate extension that bolted in....with an automatic trans i used a reverse manual valve body and elimanated the kickdown linkage.