I like AMT/ERTL kits better. Those kits gives you a choice to build what version you want - stock, custom, dragster, etc...
When I did car models and I wanted to beef them up as muscle cars, I usually kit bash them. An engine from this, valve covers from that, I don't want chrome air cleaner but I want a supercharger though, tires from this, wheels from that, etc... Well, you get the picture.