I was going to have mine recored. As it turns out I just needed a new radiator cap so I never bothered. I did recieve a verbal estimate that it would be $250 for the recore. Assumming that was a realistic estimate I would think that would be cheaper than trying to fit a 123 radiator in the 115. I did not look into the 123 radiators, so that swap may be easier than I suspect. The radiator guy did say that he was not excited about recoring the radiator and rarely recored radiators anymore since it was usually cheaper to buy a new one.

Good luck!