For a small street car (with very limited traction anyway), I'd rather have a slant than any modern four, and they can fit the same vertical space with a little induction work. I like what this guy did with an mgb and a ford 200 L6 that most older folks (including myself) have thrown away. From about 13min is the test drive. Ingenuity over cash. I'm familiar with Tony's miata slant 170 auto. Crude imho and rough around the edges, but entertaining!