Hi, you will find that the Z cars in general were made pretty cheaply in the day. I have a brand new clutch in my 260z and it feels mundane. Doors close like old GM iron. The 280 injectors could just need a good clean and you could get that done no problem and get them balanced while you were at it. All in all they are what they are, nice looking 70's technology, and cannot be compared to modern day sports cars. Maybe you should look for a nice 300zx. They were very well made and cost alot when new and had many creature comforts. Just my 2 cents.