Parts you've removed - keep or sell?

sell it, use the $$$ to pay for better goodies, my thinking is this,if the car/bike whatever the project is is anywhere near original, ie "lets keep the original parts to put back to original one day maybe..." id not change and keep original. if the parts you upgrade with supercede the original as old/worn/poo sell em/give em throw em! ive done so much i wouldnt have room for the old stuff! gave the 318 to a mate who helped me fit the 440 and kkep car there! good luck with it!