Hello all, I've searched, but haven't found exactly what I'm looking for... heres the scoop. Put a rebuilt '52 Mercury flathead in my '49 Ford. Long story short, one of the heads cracked and I replaced them with Edelbrock finned aluminum heads on it. One of the pistons detonated in the block, became molten, and has the block frozen shut. I have recently come into another rebuilt flathead, and I want to use the Edelbrock aluminum heads with it. They don't appear to be destroyed at all, but what should I do to prep them to install on the new motor? Because of the piston detonating in the block, will I have any problems doing this? What works best to clean the aluminum heads? Sorry if this is vague, or is obvious to anyone, just trying to keep my '49 on the road. Thanks!