Looking for a /6 builder in Florida

Have you pulled the head to inspect the top of the block? The biggest problem with the aluminum blocks was corrosion at the top, which can make the block unusable. Mopar spec'ed a special coolant, but you know how that was observed especially by 2nd owners. Read up on slantsix.org about the special head gasket. People there had a group buy, but probably long used up.