The later C3's are built with all the weight and aerodynamics modifications. They are also cheaper to purchase and what money you may have left over, opposed to purchasing an early C3, you can put towards restoration. Unfortunately, HP and TQ significantly decreased due to emmissions, etc. IMHO any C3 is a wonderful investment and exciting to drive. I personally like the C3 chrome bumper Vette's specifically the 73. As mentioned, it really is personal preference. What are your goals and how much money do you have to work with? Are you looking for a show car, weekend driver or daily driver? Will you be doing the work yourself? There is a lot to consider and everyone here will agree to just "be patient". You will know when the vette and time is right.