Get hold of a copy of 'The Aviation Consumer's' Used Airplane Report on the V-tail Bonanzas. Order from
www.aviationconsumer.com, and also check The American Bonanza Society's website
www.bonanza.org where someone should be able to answer all of your questions. The 1947-48 so called 'straight 35' (as opposed to subsequent A35, B35 etc) had thinner wing skins and different centre-section structures than later models, and these have been a source of structural problems. Some were strenghthened, some not.