Back up engine....yes please

This morning my friend tina told me about a TDI in the junkyard, so tomorrow im going to pull it out and save it just in case this one doesnt work... plus those engines are kinda rare so if i can get a spare for under 400 bucks im all over it. And if my curent one works then ill throw the spare in my brothers corrado and make it a soot smoking monster. stoked.