Tenrocca's the only one with a truly authentic car...
(Standard disclaimer - a winking face at the end of a sentence generally implies a level of sarcasm that some might not have otherwise picked up on...)
For the rest of us, build what floats your boat. If I wasn't such a fan of the sound of a high revving V8, I'd buy one of these for my next Cobra...
http://cgi.ebay.com.au/Falcon-FG-Tur...4#ht_500wt_928
Light, inexpensive, lots of room to widen the footboxes, heaps of power and torque with potential for unbelievable horsepower. Who's first to go this route...?