First make sure that the head isn't cracked by magnafluxing/ pressure testing it.
I would be aware of the area above the pistons as you need to check for any interference from the pistons.
If so there is material on the head to machine away to clearance the pistons. www.jandm-machine.com
I ran one on a B engine with an A gasket. That let some water get into a cylinder. Nice performance but I don't know the ratio. It's now on an A. Improved performance.