I have a stock 2002 Sport XL, but I wanted to get a little more out of it. So, I've decided on trying to squeeze a 351W stroked to 408 c.i.between the frame rails paired up with a Tremec TR-6060 six-speed stick and Lightning rear-end with 4.10 gears. My only hiccup I've thought of is how to fit the 351 and try to keep an identical weight balance. Any other tips/tricks are greatly appreciated. (I do have access to a welder and lifts)