I don't think a main girdle will make the block any stronger. A block will
handle what it can handle. I'm sure it will help however.
If you plan on pushing the limits of the stock block, and are looking
for cheaper ways to help it live longer, mabey you should forget those
worries and just get the new Boss block. At that point you shouldn't have to
worry about the block for quite a while. That's just my suggestion though.