Darth-
Lonestar makes a GT40 look-alike that uses a VW engine, or a Mazda rotary engine. Don't know anyone firsthand that has one. From a distance, it looks like a GT40, but if you were to put one next to an ERA, RF, CAV, or other replica that is 99.9% accurate, you will quickly notice they're different.
If you go the ASPP or Lonestar route, I don't think you will be 100% happy in the end. It's just such a compromise.
Best suggestion is to look for one that is incomplete (rare), or an older completed car for sale.
-Bill