I was in the same boat as you last year. I ended up cleaning my gas tank utilizing a modified version of Hot Rod Lincoln`s method with good success. I got the same report and similar price tag for a re-core on the original radiator. My radiator had one very small leak so I replaced it with this[email]
https://www.ebay.com/itm/293641970860.The fit was good I just had to use different sized hose for the lower connection. Saved the old radiator to use on an engine run stand. Good luck!
