If you want to retain the full interior AND have a legal bar or cage that you can live with in a driver, have someone who knows what they are doing bend it up and install it. IF the car will not run quicker than 11.50, you may get away with a less than legal bar which will provide some degree of safety beyond having having nothing. Any kit you buy will be a basic deal made to pass tech, be cheap, be easy to install and nothing more. Yes, it will cost a little more than having someone slap a kit together. Don't forget the frame ties.