Any damage to the front master cylinder is considered life critical in my books i.e better off to just go with a new one.
The entire braking system includes the brake lines and calipers etc. etc. you don't need to replace all of that, just the front-master cylinder and applicable lever. The risk associated with "fixing" the old m/c is just not worth it. I'd hate to lose brake pressure at any speed.
Grab one off ebay and/or upgrade to a newer GSXR master. For street applications you will be just fine with a newer one, but if you were tracking there are some details that are not worth going into unless you say so.
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