I bought mine off Ebay from a company in CA called CPP (classic performance products). My power, 4-wheel disc conv. kit cost me $775. The ONLY thing it did not include was the pre-bent brake line kit, which I HIGHLY recommend! That was another $89.

All in all, their kit was excellent. They did fail to ship me the Pontiac only, axle spacer things. They overnighted them to me and all worked out well. I will say one thing though, this is a bigger job than some would lead you to beleive. My car was on a lift, had the help of a seasoned mechanic and it still took every bit of 3-4 days total...