8 grand is an average price for a 71 Malibu with some work done and might need a little more by the time you go thru it.Each year they go up a little in value also so you can't lose there.I suggest going over the car close, check for rust in floor pans and trunk pan,and especially check for any rust in the frame!The traction bars are a sign of someone jumping on the car alot so I would listen close for noises in the rear.The trans is not a big problem as you can easily swap out.The Chevelles value has alot to do with what was already done to the car and what needs to be done to restore it or make it right.
ronvb