Don't forget he is in Finland
I'm wondering if you could have it spray welded or not and then have it remachine back to stock
I agree with Jeremiah if you can have that machine work done there and buy another cam core for the bearings you use
I had a similar experience with a 1971 6 pack 440 motor, it spun the #4 cam bearing and cause a lot of problems getting that block fixed Dang Mopar on using five different cam bearing sizes