Exhaust timing is largely responsible for the rpm range an engine performs best in. Low rpm torquers don't need big (wide) ports, they may even benefit from smallish ports to keep the gas speed up during transfer. On a 30K screamer on the other hand, wide ports are necessary for an adequate gas exchange in a very short time.

The only way you can really tell is putting a degree wheel on it, and measuring the timing. It is nearly impossible to tell anything, just by eyeballing it.