Fan question
If you're swapping to a V belt system, that means you will be swapping timing covers so you can run an LA water pump. You should be able to pick up a fan that will work in the parts for sale section here. Your /6 fan may even work if it's big enough, but a clutch fan would be ideal. Look for fans on motors in F/M/J body cars like Diplomats, Volare/Aspen/5th Avenues. Pre Magnum motor truck/van fans might work, but I'm not sure. Good luck with your build!