stock X and J heads

So many times the experts have snubbed the stock mopar heads and specifically the poor exhaust ports.When i discussed my custom cam build at length with the Ultradyne tech he specifically said to keep the exhaust and intake duration the same.His reasoning was because of the excellent stock exhaust port.
Have a look at this video!

watch
They're not all that big but they are short and a direct path. LOL (and this is a 273 head)

016.JPG