Montey,
Dave Ray has a very good reputation, he will build you a small body distributor that is converted to HEI, or he will rebuild yours. Since yours is original to the car, I would pay Dave the $5 core charge and save the original untouched.
His conversion uses all commonly available parts. DjD from Team Camaro swears by Dave's distributors.
I just bought one from him and it looks great - service was really fast (about a week turnaround) and my new distributor looks like new! The engine is still not started so I can't comment on the performance.
Here is the link,
Small Body HEI
Good Luck!
-Sam