Yea, I can understand that....But you would even need the computer and everything out of the car with the Quad cam V6. The 3400's computer has different timing settings and everything programed and your check engine light wouldn't go off. I'm also getting the same 3.4 for my '90 Grand Prix because I'm only doing the top end and computer swap....But on those engines you need to remove the intake manifold to get at the spark plugs, and it goes through timing belts mad quick