Hey Carl, WOW is right!!! I remember when I put the ' 401 ' in my Gremlin back in the 'seventies' and was amazed at the difference in the horsepower and torque that it made. I had to put a heavy chain from the right head to the frame to keep it from rising and risking a broken motormount or worse. Carl, what type of 5-speed do you have?, and what kind of driveshaft did you use? Steve from N.J.