In the beginning, there was the Monster Miata, which took a first-generation Mazda MX-5 and stuffed a 5.0-liter Ford V-8 between its front fenders. Production versions made around 225 horsepower, which was plenty of grunt to drive a car weighing just 2,100 pounds. The drawback to the swap was the weight of the Ford V8, which made the car nose...