hey i'm hoping to find out if any engine parts from the factory and the aftermarket are interchangable between series 1 and series 2 3800's......there a slew of aftermarket parts for series 2's but i can't find any for the series 1....should they interchange or am i SOL?? also i don't want to do an engine swap at this time because the series 1 i have has low miles, so i would just like to modify the existing engine.....