On a side note since your doing what i never had the chance... I'll give you some tips. the 2nd generation 99+ 3.5's used bigger throttlebodies and a better flowing intake manifold. They used a higher lift cams. From what i have been told its possible to use the rods from the older 3.8's to increase the stroke from 81mm to 86.9mm if you wanted to make a 3.8 stroker. Altho i think the first generation used free floating pistons.