I concur with RogerH's comments about rollbars. A few years ago I fitted a rollbar to a Mallock Sports Car. Most of the Motorsport manual is all about fitting a rollbar to a sedan with a full floor, it doesnt offer a lot of help to someone who is trying to fit a rollbar to a car made out of something resembling 3/4 inch furniture tubing. Needless to say we did it but it wasnt easy.
Getting back to the pre 1945 cars that will be running at Hampton Downs on April 14th there is a school of thought that stiffening up the chassis of such cars by fitting rollbars greatly affects their handling characteristics as they were designed to flex. Any comments.