If you are looking for an a body motor plate Andy at AR is now producing them. They are 3/8 aluminum and profiled. Here is the picture of the one I purchased
Same price as the others. $175 the new part # is AR361, if you call Hughes engines they can drop ship you one. The website has not been updated with the new part number yet. It is by far the best one you can buy as it is made for an a body