[xXAzureMach1Xx]

I would say eaton swap if you only want 450ish. 450 is safe on a stock motor with a good tune like with any stock motor car. 4.10 maybe alittle much of a gear for a pd blower unless you have some good dr but still goin to be all over the place I think. I think a Whipple with a eaton swap or a Kb would be over kill on a stock motor. A vortech would love a 4.10 gear and sound great ay idle.