if its a 2 wheel drive then dropping the gear ratio will help gas mileage a bit when adding the 454, she'll have plenty of power to move even with taller gears..... but yup matts right, you can redrill the frame mounts for your motor mounts.... or junkyard some.... its plenty easy to find your model in the junkyard already equipped with a big block, then you can also score a bellhousing for your tranny