I got some meaurements. Dispite the engine having 2 more cylinders, it is only about 4 inches longer than a small block. I think the straight sixes are longer than a small block as well, aren't they? The truck runs very strong and quiet. The body is just failing. I think it would be a cool swap that should run pretty good. I know a modern Hemi would spank it, but it would be a great engine to tote the post war cars nicely. I may re-start the hunt for the old car!!!