The 318 NON believers

The 360 crank in a 318 wouldn't be a 390. It would be a 344. The 4" stroke crank would be required for the 390 build and then it would only be a 384 with the standard bore 318. I've seen some pretty fast stock bore and stroke 318s in the past. None as fast as what's been talked about here......at least not naturally aspirated. Certainly that doesn't mean it cannot happen.