Port or not?

I have a set of 6X-4 heads that I am planning on putting on my 455 with a mild cam. My machine shop told me that it would be a waste to port if I was not using a big cam. Is this true? Thanks for the help.

Heck NNNNNNNNOOOOOOOO!!!!!!!!!!!!! it isn't
That would probably be the best thing to Do!

JUST PORT IT. YOU'LL BE GLAD YOU DID.
SOUNDS LIKE THIS GUY WANTS TO SELL YOU A NEW BIG CAM.

Why not do both?...or do you not want to use even more gas?...