Technically not a traditional hot rods and customs, but the ultimate OPEL: OPEL 1914 GP Race car 760 cui, 4-cylinder, 4-valve with crown&pinion gear. Max rpm 2.900. Seen this car many times in my mate's shop who restored it for the museum. Your engine thread made me join. Love those Duesenbergs!
I also worked on the most kick-*** racing car/engine one can imagine: 1972 Mclaren M8F. Find Hakkinen's comments on driving a M8D elsewhere on the web... He explained it quite well. Alas, this car and the Can-Am series are too new for this forum Build years of either averaged at 1943 might just qualify?
I am in Newlands Was actually briefly at the last Natter. Next time I aim to bring a Maserati in bare ally