well to start what year is yor 140? if its a 73-74' then a 240 momo,sparco,omp adapters will work. they interfere with the plastic stuff around the steering colum, but as you said its a race car so you probbly don't have that stuff there anymore. the -72' steering colum has a different spline size than the 73'+. i have a personal hub adapter for -72' that i could get rid of cheap. there are adapter/spacers availibale for the nardi/personal hubs to the momo/sparco/omp wheels. i'm a dealer for sparco and omp. i'll look into if there is anything still available, but i dought its been available for 10+ years.
you last option and probably the cheapest is to get a quick relese one from a stock car place. they don't bolt on though. you will have to weld the quick release boss to you steering shaft. best of luck.