[ZOERA-SC7XX]

Getting back to the original question about performance differences, the new car should almost always outperform the old car. Every car made has different engine capabilities, but handling qualities of the new replicas (any quality replica) are probably much superior to the original due to modern engineering, build techniques and chassis geometry (not to mention superior brakes and shocks). Just look at the FFR replica. It may be the best performing Cobra replica made (depending on engine specifications), although it may not be the most desireable.
The magazine article had the right idea, if only to compare differences.