I would recommend one that moves the power steering pump up. You can shed some weight by removing the condenser, pump, hoses, and bypass the smog pump all in one shot. I used a 70.5 with underdrives and smog pump bypassed. I just did mine last weekend and it was very easy. The pullies that replace your current set-up are a waste IMO, you don't lose any real weight and your still drain HP by turning another pully. The part # for the Ford racing kit is M-8511-A50, these sell for $40-$50 if I remember right, just look for a used one.