Sure you can have your's rebuilt.......but it needs to be rebuilt by someone that really knows what the 700 needs to be reliable. Contact some of the performance guys around you and see who they recommend.
You could also call Michael Reed who now owns "Freakshow" coverters in Abilene, Tex. (325) 701-7830. He builds a great converter and comes highly recommended. Go to www.yellowbullet.com
and search Freakshow converters, you'll see 14/15 pages of attaboys for Michael. His converters are well priced and free shipping.