I think that this comes down to two realities:
>Dropping a V-8 into a Miata will produce a car with such an incredibly bad weight distribution that its handling and traction would be severely compromised. Yes, it would have incredible acceleration (after initial wheel-spin), but…when you came to the first curve, you would likely wind up hitting the guardrail due to extreme understeer at higher speeds, as a result of the really bad weight distribution.
While it is impossible to know for sure, I would estimate that this type of conversion would result in weight distribution in the range of 70/30–which always spells disaster in terms of handling.
If you want to see an example of this phenomenon, look for road test reviews of the Studebaker Golden Hawk. In 1956, when Studebaker decided to drop the 352 c.i. Packard V-8 into the Hawk, they got incredible acceleration, albeit with really bad handling. After such bad results with this heavy Packard V-8, they decided to install a supercharger on the much lighter Studebaker V-8 for the 1957-58 models. The result was a Golden Hawk with…equally good acceleration (better than the '57 Corvette, actually!)…and decent handling–as a result of better weight distribution coupled with equivalent power output.
The moral of the story is that if a car manufacturer can’t come up with decent handling for a car with a really heavy front end, you won’t be able to do so either.
Just because something can be done does not mean that it should be done.
>Your friends (the ones who say, “a Miata is a girls car and any hetero guy shouldn’t have one”) have simply demonstrated how incredibly insecure they are about their own sexuality. If somebody is confident about his own sexual identity, he would not care what the insecure people have to say about his car choices.