The frame is in good shape, except that dent. the best way would be bondo. The other way would be drill a tiny hole and pull it out. but, its aluminum... so not the best idea.
The for would be a standard 1" fork. I do not have any forks for it. I have parts, but they would not be time period correct.
let me know, These frames need to find a new home. Instead of turning into a aluminum can.