Can i fix this at home?

Yes, that is about right, I've read some of your posts about your times and runs. I must say I am very impressed with your runs. But I still would not build you a motor with a repaired block. No offense to you it's more of a safety factor. I wouldn't feel I did my job right if something where to go wrong. We as racers and builders have lost enough great people in Ower sport both men and women.