Awsome, the body and chassis are the most valuable parts, as they are almost impossible to replace if damaged or rusted beyond repair.
As long as you have them then rebuilding the car becomes much easier, all you need is either a donor car, or enough money to buy new parts.
Things like the guages are all avliable aftermarket, new or used/rebuilt. Things like the seats and interior can be easily retrimmed, and if an orginal engine isn't avliable one from a herald or spitfire can be made to fit and work very easily.