i have a 71 chevelle with BB springs and i need SB springs, will the one out of a 72 nova fit? if not does anyone have some for sale?

I am about to go from sb to bb so maybe we could do a trade? The ones i have are a little rusty but they have been sitting basically unloaded (no motor in car) for a long time?

i would trade, but i going to put a BB in the car when i get the money, just need to bring the frot end down until i can afford one