There is a Renault 5 Gordini and a Renault 5 Gordini Turbo.
I dont know where you heard that they only turbod it for the track, thats certainly not true.
I had a Gordini Turbo last year, brought it as a project but never finished it.
They run very low boost and use a suck through carb and turbo setup rather than the more widely used blow through. They dont use an intercooler either.
They use a Cross-flow big valve head and tubular exhaust manifold too, which is much better than the head that the GT Turbo uses. Im currently fitting a Gordini turbo head and manifolds to my GT Turbo block.
Also, they werent all called Alpines. Only a handfull came with the word Alpine cast onto the rocker cover, most of them were the French versions.