Keep up the good work and don't worry too much about adding the odd bulge or scoop. Racing cars of the period are often covered in them as the car was dynamically developed in the pits. At risk of getting into a silly 'I've found one with more scoops' arms race, I'd say the inspiration for my Spyder, the Lancia D24, probably has the most afterthought holes, scoops, flaps and bulges that I've come across -
Period pictures also show that these cars often ran with a radiator blind, which looked suspiciously like half a dustbin lid, blanking off half the front grille, presumably for use in cold weather.
Looking round the 50's race cars at Goodwood, Snetterton etc., the bodywork and paint on the originals often really isn't very good. After all, they weren't intended as show quality cars, they were built to win races.