Installed 455 with th400 into '66 Lemans convertible. (originally had 326 w/st300). Used original motor mounts, and location is perfect. Used original shift cable and bracket, re-drilled bracket at transmission- detents at shifter still line up-will even go into first if you press the button on shifter. Installed th400 yoke onto original driveshaft. Fit like a glove. Installed driveshaft (previously shortened 5/8") onto short output on trans., there is 3/4" between output and shoulder of yoke, (should be o.k., yes?). Only real problem seems to be the crossmember to frame mounts. Installed center bolts on trans. to crossmember, and mounting holes are 6 1/4" away on both sides from frame mount holes. Am I relegated to having to weld the frame mounts to the new location, or is it possible to use a piece of say, 1/4" plate steel on either side and use the existing holes to attach, to make up the difference? Or, is there a different crossmember I can use? I'm pretty excited about this, and need to go CRUISING SOON,!!!!!!!!!! (or I shall surely perish). THANKS!!!!!