Why not a 406? those extra cubes make a difference especially for torque. In front of a 2004-R and 3.42s it did a pretty good burnout, but now with a th350 and an ATI treemaster converter it'll spin until I take my foot off the gas. Depending on your budget you might be better off spending the money on a real good set of heads and a cam. My dad's old motor was a 350 that put his 3500lb nova into the 11's.